DevTools: roll CodeMirror

third_party/WebKit/Source/devtools/front_end/cm/codemirror.js

 // CodeMirror, copyright (c) by Marijn Haverbeke and others
 // Distributed under an MIT license: http://codemirror.net/LICENSE
 
 // This is CodeMirror (http://codemirror.net), a code editor
 // implemented in JavaScript on top of the browser's DOM.
 //
 // You can find some technical background for some of the code below
 // at http://marijnhaverbeke.nl/blog/#cm-internals .
 
 (function(mod) {
   if (typeof exports == "object" && typeof module == "object") // CommonJS
     module.exports = mod();
   else if (typeof define == "function" && define.amd) // AMD
     return define([], mod);
   else // Plain browser env
-    this.CodeMirror = mod();
+    (this || window).CodeMirror = mod();
 })(function() {
   "use strict";
 
   // BROWSER SNIFFING
 
   // Kludges for bugs and behavior differences that can't be feature
   // detected are enabled based on userAgent etc sniffing.
+  var userAgent = navigator.userAgent;
+  var platform = navigator.platform;
 
-  var gecko = /gecko\/\d/i.test(navigator.userAgent);
-  // ie_uptoN means Internet Explorer version N or lower
-  var ie_upto10 = /MSIE \d/.test(navigator.userAgent);
-  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(navigator.userAgent);
+  var gecko = /gecko\/\d/i.test(userAgent);
+  var ie_upto10 = /MSIE \d/.test(userAgent);
+  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
   var ie = ie_upto10 || ie_11up;
   var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : ie_11up[1]);
-  var webkit = /WebKit\//.test(navigator.userAgent);
-  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
-  var chrome = /Chrome\//.test(navigator.userAgent);
-  var presto = /Opera\//.test(navigator.userAgent);
+  var webkit = /WebKit\//.test(userAgent);
+  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
+  var chrome = /Chrome\//.test(userAgent);
+  var presto = /Opera\//.test(userAgent);
   var safari = /Apple Computer/.test(navigator.vendor);
-  var khtml = /KHTML\//.test(navigator.userAgent);
-  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
-  var phantom = /PhantomJS/.test(navigator.userAgent);
+  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
+  var phantom = /PhantomJS/.test(userAgent);
 
-  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
+  var ios = /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
   // This is woefully incomplete. Suggestions for alternative methods welcome.
-  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
-  var mac = ios || /Mac/.test(navigator.platform);
-  var windows = /win/i.test(navigator.platform);
+  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
+  var mac = ios || /Mac/.test(platform);
+  var chromeOS = /\bCrOS\b/.test(userAgent);
+  var windows = /win/i.test(platform);
 
-  var presto_version = presto && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
+  var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
   if (presto_version) presto_version = Number(presto_version[1]);
   if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
   // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
   var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
   var captureRightClick = gecko || (ie && ie_version >= 9);
 
   // Optimize some code when these features are not used.
   var sawReadOnlySpans = false, sawCollapsedSpans = false;
 
   // EDITOR CONSTRUCTOR
 
   // A CodeMirror instance represents an editor. This is the object
   // that user code is usually dealing with.
 
   function CodeMirror(place, options) {
     if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
 
     this.options = options = options ? copyObj(options) : {};
     // Determine effective options based on given values and defaults.
     copyObj(defaults, options, false);
     setGuttersForLineNumbers(options);
 
     var doc = options.value;
-    if (typeof doc == "string") doc = new Doc(doc, options.mode);
+    if (typeof doc == "string") doc = new Doc(doc, options.mode, null, options.lineSeparator);
     this.doc = doc;
 
-    var display = this.display = new Display(place, doc);
+    var input = new CodeMirror.inputStyles[options.inputStyle](this);
+    var display = this.display = new Display(place, doc, input);
     display.wrapper.CodeMirror = this;
     updateGutters(this);
     themeChanged(this);
     if (options.lineWrapping)
       this.display.wrapper.className += " CodeMirror-wrap";
-    if (options.autofocus && !mobile) focusInput(this);
+    if (options.autofocus && !mobile) display.input.focus();
     initScrollbars(this);
 
     this.state = {
       keyMaps: [],  // stores maps added by addKeyMap
       overlays: [], // highlighting overlays, as added by addOverlay
       modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
-      overwrite: false, focused: false,
+      overwrite: false,
+      delayingBlurEvent: false,
+      focused: false,
       suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
-      pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in readInput
+      pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
+      selectingText: false,
       draggingText: false,
       highlight: new Delayed(), // stores highlight worker timeout
-      keySeq: null  // Unfinished key sequence
+      keySeq: null,  // Unfinished key sequence
+      specialChars: null
     };
 
+    var cm = this;
+
     // Override magic textarea content restore that IE sometimes does
     // on our hidden textarea on reload
-    if (ie && ie_version < 11) setTimeout(bind(resetInput, this, true), 20);
+    if (ie && ie_version < 11) setTimeout(function() { cm.display.input.reset(true); }, 20);
 
     registerEventHandlers(this);
     ensureGlobalHandlers();
 
     startOperation(this);
     this.curOp.forceUpdate = true;
     attachDoc(this, doc);
 
-    if ((options.autofocus && !mobile) || activeElt() == display.input)
+    if ((options.autofocus && !mobile) || cm.hasFocus())
       setTimeout(bind(onFocus, this), 20);
     else
       onBlur(this);
 
     for (var opt in optionHandlers) if (optionHandlers.hasOwnProperty(opt))
       optionHandlers[opt](this, options[opt], Init);
     maybeUpdateLineNumberWidth(this);
+    if (options.finishInit) options.finishInit(this);
     for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
     endOperation(this);
     // Suppress optimizelegibility in Webkit, since it breaks text
     // measuring on line wrapping boundaries.
     if (webkit && options.lineWrapping &&
         getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
       display.lineDiv.style.textRendering = "auto";
   }
 
   // DISPLAY CONSTRUCTOR
 
   // The display handles the DOM integration, both for input reading
   // and content drawing. It holds references to DOM nodes and
   // display-related state.
 
-  function Display(place, doc) {
+  function Display(place, doc, input) {
     var d = this;
+    this.input = input;
 
-    // The semihidden textarea that is focused when the editor is
-    // focused, and receives input.
-    var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
-    // The textarea is kept positioned near the cursor to prevent the
-    // fact that it'll be scrolled into view on input from scrolling
-    // our fake cursor out of view. On webkit, when wrap=off, paste is
-    // very slow. So make the area wide instead.
-    if (webkit) input.style.width = "1000px";
-    else input.setAttribute("wrap", "off");
-    // If border: 0; -- iOS fails to open keyboard (issue #1287)
-    if (ios) input.style.border = "1px solid black";
-    input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off"); input.setAttribute("spellcheck", "false");
-
-    // Wraps and hides input textarea
-    d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
     // Covers bottom-right square when both scrollbars are present.
     d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
-    d.scrollbarFiller.setAttribute("not-content", "true");
+    d.scrollbarFiller.setAttribute("cm-not-content", "true");
     // Covers bottom of gutter when coverGutterNextToScrollbar is on
     // and h scrollbar is present.
     d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
-    d.gutterFiller.setAttribute("not-content", "true");
+    d.gutterFiller.setAttribute("cm-not-content", "true");
     // Will contain the actual code, positioned to cover the viewport.
     d.lineDiv = elt("div", null, "CodeMirror-code");
     // Elements are added to these to represent selection and cursors.
     d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
     d.cursorDiv = elt("div", null, "CodeMirror-cursors");
     // A visibility: hidden element used to find the size of things.
     d.measure = elt("div", null, "CodeMirror-measure");
     // When lines outside of the viewport are measured, they are drawn in this.
     d.lineMeasure = elt("div", null, "CodeMirror-measure");
     // Wraps everything that needs to exist inside the vertically-padded coordinate system
     d.lineSpace = elt("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
                       null, "position: relative; outline: none");
     // Moved around its parent to cover visible view.
     d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
     // Set to the height of the document, allowing scrolling.
     d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
     d.sizerWidth = null;
     // Behavior of elts with overflow: auto and padding is
     // inconsistent across browsers. This is used to ensure the
     // scrollable area is big enough.
     d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
     // Will contain the gutters, if any.
     d.gutters = elt("div", null, "CodeMirror-gutters");
     d.lineGutter = null;
     // Actual scrollable element.
     d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
     d.scroller.setAttribute("tabIndex", "-1");
     // The element in which the editor lives.
-    d.wrapper = elt("div", [d.inputDiv, d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
+    d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
 
     // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
     if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
-    // Needed to hide big blue blinking cursor on Mobile Safari
-    if (ios) input.style.width = "0px";
-    if (!webkit) d.scroller.draggable = true;
-    // Needed to handle Tab key in KHTML
-    if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
+    if (!webkit && !(gecko && mobile)) d.scroller.draggable = true;
 
     if (place) {
       if (place.appendChild) place.appendChild(d.wrapper);
       else place(d.wrapper);
     }
 
     // Current rendered range (may be bigger than the view window).
     d.viewFrom = d.viewTo = doc.first;
     d.reportedViewFrom = d.reportedViewTo = doc.first;
     // Information about the rendered lines.
     d.view = [];
     d.renderedView = null;
     // Holds info about a single rendered line when it was rendered
     // for measurement, while not in view.
     d.externalMeasured = null;
     // Empty space (in pixels) above the view
     d.viewOffset = 0;
     d.lastWrapHeight = d.lastWrapWidth = 0;
     d.updateLineNumbers = null;
 
     d.nativeBarWidth = d.barHeight = d.barWidth = 0;
     d.scrollbarsClipped = false;
 
     // Used to only resize the line number gutter when necessary (when
     // the amount of lines crosses a boundary that makes its width change)
     d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
-    // See readInput and resetInput
-    d.prevInput = "";
     // Set to true when a non-horizontal-scrolling line widget is
     // added. As an optimization, line widget aligning is skipped when
     // this is false.
     d.alignWidgets = false;
-    // Flag that indicates whether we expect input to appear real soon
-    // now (after some event like 'keypress' or 'input') and are
-    // polling intensively.
-    d.pollingFast = false;
-    // Self-resetting timeout for the poller
-    d.poll = new Delayed();
 
     d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
 
-    // Tracks when resetInput has punted to just putting a short
-    // string into the textarea instead of the full selection.
-    d.inaccurateSelection = false;
-
     // Tracks the maximum line length so that the horizontal scrollbar
     // can be kept static when scrolling.
     d.maxLine = null;
     d.maxLineLength = 0;
     d.maxLineChanged = false;
 
     // Used for measuring wheel scrolling granularity
     d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
 
     // True when shift is held down.
     d.shift = false;
 
     // Used to track whether anything happened since the context menu
     // was opened.
     d.selForContextMenu = null;
+
+    d.activeTouch = null;
+
+    input.init(d);
   }
 
   // STATE UPDATES
 
   // Used to get the editor into a consistent state again when options change.
 
   function loadMode(cm) {
     cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
     resetModeState(cm);
   }
@@ skipping 161 matching lines @@
     var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
     place(vert); place(horiz);
 
     on(vert, "scroll", function() {
       if (vert.clientHeight) scroll(vert.scrollTop, "vertical");
     });
     on(horiz, "scroll", function() {
       if (horiz.clientWidth) scroll(horiz.scrollLeft, "horizontal");
     });
 
-    this.checkedOverlay = false;
+    this.checkedZeroWidth = false;
     // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
     if (ie && ie_version < 8) this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
   }
 
   NativeScrollbars.prototype = copyObj({
     update: function(measure) {
       var needsH = measure.scrollWidth > measure.clientWidth + 1;
       var needsV = measure.scrollHeight > measure.clientHeight + 1;
       var sWidth = measure.nativeBarWidth;
 
@@ skipping 14 matching lines @@
         this.horiz.style.right = needsV ? sWidth + "px" : "0";
         this.horiz.style.left = measure.barLeft + "px";
         var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
         this.horiz.firstChild.style.width =
           (measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
       } else {
         this.horiz.style.display = "";
         this.horiz.firstChild.style.width = "0";
       }
 
-      if (!this.checkedOverlay && measure.clientHeight > 0) {
-        if (sWidth == 0) this.overlayHack();
-        this.checkedOverlay = true;
+      if (!this.checkedZeroWidth && measure.clientHeight > 0) {
+        if (sWidth == 0) this.zeroWidthHack();
+        this.checkedZeroWidth = true;
       }
 
       return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0};
     },
     setScrollLeft: function(pos) {
       if (this.horiz.scrollLeft != pos) this.horiz.scrollLeft = pos;
+      if (this.disableHoriz) this.enableZeroWidthBar(this.horiz, this.disableHoriz);
     },
     setScrollTop: function(pos) {
       if (this.vert.scrollTop != pos) this.vert.scrollTop = pos;
+      if (this.disableVert) this.enableZeroWidthBar(this.vert, this.disableVert);
     },
-    overlayHack: function() {
+    zeroWidthHack: function() {
       var w = mac && !mac_geMountainLion ? "12px" : "18px";
-      this.horiz.style.minHeight = this.vert.style.minWidth = w;
-      var self = this;
-      var barMouseDown = function(e) {
-        if (e_target(e) != self.vert && e_target(e) != self.horiz)
-          operation(self.cm, onMouseDown)(e);
-      };
-      on(this.vert, "mousedown", barMouseDown);
-      on(this.horiz, "mousedown", barMouseDown);
+      this.horiz.style.height = this.vert.style.width = w;
+      this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
+      this.disableHoriz = new Delayed;
+      this.disableVert = new Delayed;
+    },
+    enableZeroWidthBar: function(bar, delay) {
+      bar.style.pointerEvents = "auto";
+      function maybeDisable() {
+        // To find out whether the scrollbar is still visible, we
+        // check whether the element under the pixel in the bottom
+        // left corner of the scrollbar box is the scrollbar box
+        // itself (when the bar is still visible) or its filler child
+        // (when the bar is hidden). If it is still visible, we keep
+        // it enabled, if it's hidden, we disable pointer events.
+        var box = bar.getBoundingClientRect();
+        var elt = document.elementFromPoint(box.left + 1, box.bottom - 1);
+        if (elt != bar) bar.style.pointerEvents = "none";
+        else delay.set(1000, maybeDisable);
+      }
+      delay.set(1000, maybeDisable);
     },
     clear: function() {
       var parent = this.horiz.parentNode;
       parent.removeChild(this.horiz);
       parent.removeChild(this.vert);
     }
   }, NativeScrollbars.prototype);
 
   function NullScrollbars() {}
 
   NullScrollbars.prototype = copyObj({
     update: function() { return {bottom: 0, right: 0}; },
     setScrollLeft: function() {},
     setScrollTop: function() {},
     clear: function() {}
   }, NullScrollbars.prototype);
 
   CodeMirror.scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};
 
   function initScrollbars(cm) {
     if (cm.display.scrollbars) {
       cm.display.scrollbars.clear();
       if (cm.display.scrollbars.addClass)
         rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
     }
 
     cm.display.scrollbars = new CodeMirror.scrollbarModel[cm.options.scrollbarStyle](function(node) {
       cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
+      // Prevent clicks in the scrollbars from killing focus
       on(node, "mousedown", function() {
-        if (cm.state.focused) setTimeout(bind(focusInput, cm), 0);
+        if (cm.state.focused) setTimeout(function() { cm.display.input.focus(); }, 0);
       });
-      node.setAttribute("not-content", "true");
+      node.setAttribute("cm-not-content", "true");
     }, function(pos, axis) {
       if (axis == "horizontal") setScrollLeft(cm, pos);
       else setScrollTop(cm, pos);
     }, cm);
     if (cm.display.scrollbars.addClass)
       addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
   }
 
   function updateScrollbars(cm, measure) {
     if (!measure) measure = measureForScrollbars(cm);
     var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
     updateScrollbarsInner(cm, measure);
     for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
       if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
         updateHeightsInViewport(cm);
       updateScrollbarsInner(cm, measureForScrollbars(cm));
       startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
     }
   }
 
   // Re-synchronize the fake scrollbars with the actual size of the
   // content.
   function updateScrollbarsInner(cm, measure) {
     var d = cm.display;
     var sizes = d.scrollbars.update(measure);
 
     d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
     d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
+    d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"
 
     if (sizes.right && sizes.bottom) {
       d.scrollbarFiller.style.display = "block";
       d.scrollbarFiller.style.height = sizes.bottom + "px";
       d.scrollbarFiller.style.width = sizes.right + "px";
     } else d.scrollbarFiller.style.display = "";
     if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
       d.gutterFiller.style.display = "block";
       d.gutterFiller.style.height = sizes.bottom + "px";
       d.gutterFiller.style.width = measure.gutterWidth + "px";
@@ skipping 48 matching lines @@
   // size for the current document size. Returns true when an update
   // is needed.
   function maybeUpdateLineNumberWidth(cm) {
     if (!cm.options.lineNumbers) return false;
     var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
     if (last.length != display.lineNumChars) {
       var test = display.measure.appendChild(elt("div", [elt("div", last)],
                                                  "CodeMirror-linenumber CodeMirror-gutter-elt"));
       var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
       display.lineGutter.style.width = "";
-      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
+      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
       display.lineNumWidth = display.lineNumInnerWidth + padding;
       display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
       display.lineGutter.style.width = display.lineNumWidth + "px";
       updateGutterSpace(cm);
       return true;
     }
     return false;
   }
 
   function lineNumberFor(options, i) {
@@ skipping 14 matching lines @@
 
     this.viewport = viewport;
     // Store some values that we'll need later (but don't want to force a relayout for)
     this.visible = visibleLines(display, cm.doc, viewport);
     this.editorIsHidden = !display.wrapper.offsetWidth;
     this.wrapperHeight = display.wrapper.clientHeight;
     this.wrapperWidth = display.wrapper.clientWidth;
     this.oldDisplayWidth = displayWidth(cm);
     this.force = force;
     this.dims = getDimensions(cm);
+    this.events = [];
   }
 
+  DisplayUpdate.prototype.signal = function(emitter, type) {
+    if (hasHandler(emitter, type))
+      this.events.push(arguments);
+  };
+  DisplayUpdate.prototype.finish = function() {
+    for (var i = 0; i < this.events.length; i++)
+      signal.apply(null, this.events[i]);
+  };
+
   function maybeClipScrollbars(cm) {
     var display = cm.display;
     if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
       display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
       display.heightForcer.style.height = scrollGap(cm) + "px";
       display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
       display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
       display.scrollbarsClipped = true;
     }
   }
@@ skipping 53 matching lines @@
     if (toUpdate > 4) display.lineDiv.style.display = "";
     display.renderedView = display.view;
     // There might have been a widget with a focused element that got
     // hidden or updated, if so re-focus it.
     if (focused && activeElt() != focused && focused.offsetHeight) focused.focus();
 
     // Prevent selection and cursors from interfering with the scroll
     // width and height.
     removeChildren(display.cursorDiv);
     removeChildren(display.selectionDiv);
-    display.gutters.style.height = 0;
+    display.gutters.style.height = display.sizer.style.minHeight = 0;
 
     if (different) {
       display.lastWrapHeight = update.wrapperHeight;
       display.lastWrapWidth = update.wrapperWidth;
       startWorker(cm, 400);
     }
 
     display.updateLineNumbers = null;
 
     return true;
   }
 
   function postUpdateDisplay(cm, update) {
-    var force = update.force, viewport = update.viewport;
+    var viewport = update.viewport;
+
     for (var first = true;; first = false) {
-      if (first && cm.options.lineWrapping && update.oldDisplayWidth != displayWidth(cm)) {
-        force = true;
-      } else {
-        force = false;
+      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
         // Clip forced viewport to actual scrollable area.
         if (viewport && viewport.top != null)
           viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)};
         // Updated line heights might result in the drawn area not
         // actually covering the viewport. Keep looping until it does.
         update.visible = visibleLines(cm.display, cm.doc, viewport);
         if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
           break;
       }
       if (!updateDisplayIfNeeded(cm, update)) break;
       updateHeightsInViewport(cm);
       var barMeasure = measureForScrollbars(cm);
       updateSelection(cm);
+      updateScrollbars(cm, barMeasure);
       setDocumentHeight(cm, barMeasure);
-      updateScrollbars(cm, barMeasure);
     }
 
-    signalLater(cm, "update", cm);
+    update.signal(cm, "update", cm);
     if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
-      signalLater(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
+      update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
       cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
     }
   }
 
   function updateDisplaySimple(cm, viewport) {
     var update = new DisplayUpdate(cm, viewport);
     if (updateDisplayIfNeeded(cm, update)) {
       updateHeightsInViewport(cm);
       postUpdateDisplay(cm, update);
       var barMeasure = measureForScrollbars(cm);
       updateSelection(cm);
+      updateScrollbars(cm, barMeasure);
       setDocumentHeight(cm, barMeasure);
-      updateScrollbars(cm, barMeasure);
+      update.finish();
     }
   }
 
   function setDocumentHeight(cm, measure) {
     cm.display.sizer.style.minHeight = measure.docHeight + "px";
-    var total = measure.docHeight + cm.display.barHeight;
-    cm.display.heightForcer.style.top = total + "px";
-    cm.display.gutters.style.height = Math.max(total + scrollGap(cm), measure.clientHeight) + "px";
+    cm.display.heightForcer.style.top = measure.docHeight + "px";
+    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
   }
 
   // Read the actual heights of the rendered lines, and update their
   // stored heights to match.
   function updateHeightsInViewport(cm) {
     var display = cm.display;
     var prevBottom = display.lineDiv.offsetTop;
     for (var i = 0; i < display.view.length; i++) {
       var cur = display.view[i], height;
       if (cur.hidden) continue;
@@ skipping 13 matching lines @@
         if (cur.rest) for (var j = 0; j < cur.rest.length; j++)
           updateWidgetHeight(cur.rest[j]);
       }
     }
   }
 
   // Read and store the height of line widgets associated with the
   // given line.
   function updateWidgetHeight(line) {
     if (line.widgets) for (var i = 0; i < line.widgets.length; ++i)
-      line.widgets[i].height = line.widgets[i].node.offsetHeight;
+      line.widgets[i].height = line.widgets[i].node.parentNode.offsetHeight;
   }
 
   // Do a bulk-read of the DOM positions and sizes needed to draw the
   // view, so that we don't interleave reading and writing to the DOM.
   function getDimensions(cm) {
     var d = cm.display, left = {}, width = {};
     var gutterLeft = d.gutters.clientLeft;
     for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
       left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
       width[cm.options.gutters[i]] = n.clientWidth;
@@ skipping 22 matching lines @@
         node.parentNode.removeChild(node);
       return next;
     }
 
     var view = display.view, lineN = display.viewFrom;
     // Loop over the elements in the view, syncing cur (the DOM nodes
     // in display.lineDiv) with the view as we go.
     for (var i = 0; i < view.length; i++) {
       var lineView = view[i];
       if (lineView.hidden) {
-      } else if (!lineView.node) { // Not drawn yet
+      } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
         var node = buildLineElement(cm, lineView, lineN, dims);
         container.insertBefore(node, cur);
       } else { // Already drawn
         while (cur != lineView.node) cur = rm(cur);
         var updateNumber = lineNumbers && updateNumbersFrom != null &&
           updateNumbersFrom <= lineN && lineView.lineNumber;
         if (lineView.changes) {
           if (indexOf(lineView.changes, "gutter") > -1) updateNumber = false;
           updateLineForChanges(cm, lineView, lineN, dims);
         }
@@ skipping 10 matching lines @@
 
   // When an aspect of a line changes, a string is added to
   // lineView.changes. This updates the relevant part of the line's
   // DOM structure.
   function updateLineForChanges(cm, lineView, lineN, dims) {
     for (var j = 0; j < lineView.changes.length; j++) {
       var type = lineView.changes[j];
       if (type == "text") updateLineText(cm, lineView);
       else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims);
       else if (type == "class") updateLineClasses(lineView);
-      else if (type == "widget") updateLineWidgets(lineView, dims);
+      else if (type == "widget") updateLineWidgets(cm, lineView, dims);
     }
     lineView.changes = null;
   }
 
   // Lines with gutter elements, widgets or a background class need to
   // be wrapped, and have the extra elements added to the wrapper div
   function ensureLineWrapped(lineView) {
     if (lineView.node == lineView.text) {
       lineView.node = elt("div", null, null, "position: relative");
       if (lineView.text.parentNode)
@@ skipping 54 matching lines @@
       lineView.node.className = "";
     var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
     lineView.text.className = textClass || "";
   }
 
   function updateLineGutter(cm, lineView, lineN, dims) {
     if (lineView.gutter) {
       lineView.node.removeChild(lineView.gutter);
       lineView.gutter = null;
     }
+    if (lineView.gutterBackground) {
+      lineView.node.removeChild(lineView.gutterBackground);
+      lineView.gutterBackground = null;
+    }
+    if (lineView.line.gutterClass) {
+      var wrap = ensureLineWrapped(lineView);
+      lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
+                                      "left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
+                                      "px; width: " + dims.gutterTotalWidth + "px");
+      wrap.insertBefore(lineView.gutterBackground, lineView.text);
+    }
     var markers = lineView.line.gutterMarkers;
     if (cm.options.lineNumbers || markers) {
       var wrap = ensureLineWrapped(lineView);
-      var gutterWrap = lineView.gutter =
-        wrap.insertBefore(elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
-                              (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
-                              "px; width: " + dims.gutterTotalWidth + "px"),
-                          lineView.text);
+      var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
+                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px");
+      cm.display.input.setUneditable(gutterWrap);
+      wrap.insertBefore(gutterWrap, lineView.text);
       if (lineView.line.gutterClass)
         gutterWrap.className += " " + lineView.line.gutterClass;
       if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
         lineView.lineNumber = gutterWrap.appendChild(
           elt("div", lineNumberFor(cm.options, lineN),
               "CodeMirror-linenumber CodeMirror-gutter-elt",
               "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
               + cm.display.lineNumInnerWidth + "px"));
       if (markers) for (var k = 0; k < cm.options.gutters.length; ++k) {
         var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
         if (found)
           gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
                                      dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
       }
     }
   }
 
-  function updateLineWidgets(lineView, dims) {
+  function updateLineWidgets(cm, lineView, dims) {
     if (lineView.alignable) lineView.alignable = null;
     for (var node = lineView.node.firstChild, next; node; node = next) {
       var next = node.nextSibling;
       if (node.className == "CodeMirror-linewidget")
         lineView.node.removeChild(node);
     }
-    insertLineWidgets(lineView, dims);
+    insertLineWidgets(cm, lineView, dims);
   }
 
   // Build a line's DOM representation from scratch
   function buildLineElement(cm, lineView, lineN, dims) {
     var built = getLineContent(cm, lineView);
     lineView.text = lineView.node = built.pre;
     if (built.bgClass) lineView.bgClass = built.bgClass;
     if (built.textClass) lineView.textClass = built.textClass;
 
     updateLineClasses(lineView);
     updateLineGutter(cm, lineView, lineN, dims);
-    insertLineWidgets(lineView, dims);
+    insertLineWidgets(cm, lineView, dims);
     return lineView.node;
   }
 
   // A lineView may contain multiple logical lines (when merged by
   // collapsed spans). The widgets for all of them need to be drawn.
-  function insertLineWidgets(lineView, dims) {
-    insertLineWidgetsFor(lineView.line, lineView, dims, true);
+  function insertLineWidgets(cm, lineView, dims) {
+    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
     if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
-      insertLineWidgetsFor(lineView.rest[i], lineView, dims, false);
+      insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
   }
 
-  function insertLineWidgetsFor(line, lineView, dims, allowAbove) {
+  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
     if (!line.widgets) return;
     var wrap = ensureLineWrapped(lineView);
     for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
       var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
       if (!widget.handleMouseEvents) node.setAttribute("cm-ignore-events", "true");
       positionLineWidget(widget, node, lineView, dims);
+      cm.display.input.setUneditable(node);
       if (allowAbove && widget.above)
         wrap.insertBefore(node, lineView.gutter || lineView.text);
       else
         wrap.appendChild(node);
       signalLater(widget, "redraw");
     }
   }
 
   function positionLineWidget(widget, node, lineView, dims) {
     if (widget.noHScroll) {
@@ skipping 22 matching lines @@
   };
 
   // Compare two positions, return 0 if they are the same, a negative
   // number when a is less, and a positive number otherwise.
   var cmp = CodeMirror.cmpPos = function(a, b) { return a.line - b.line || a.ch - b.ch; };
 
   function copyPos(x) {return Pos(x.line, x.ch);}
   function maxPos(a, b) { return cmp(a, b) < 0 ? b : a; }
   function minPos(a, b) { return cmp(a, b) < 0 ? a : b; }
 
+  // INPUT HANDLING
+
+  function ensureFocus(cm) {
+    if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
+  }
+
+  // This will be set to a {lineWise: bool, text: [string]} object, so
+  // that, when pasting, we know what kind of selections the copied
+  // text was made out of.
+  var lastCopied = null;
+
+  function applyTextInput(cm, inserted, deleted, sel, origin) {
+    var doc = cm.doc;
+    cm.display.shift = false;
+    if (!sel) sel = doc.sel;
+
+    var paste = cm.state.pasteIncoming || origin == "paste";
+    var textLines = doc.splitLines(inserted), multiPaste = null
+    // When pasing N lines into N selections, insert one line per selection
+    if (paste && sel.ranges.length > 1) {
+      if (lastCopied && lastCopied.text.join("\n") == inserted) {
+        if (sel.ranges.length % lastCopied.text.length == 0) {
+          multiPaste = [];
+          for (var i = 0; i < lastCopied.text.length; i++)
+            multiPaste.push(doc.splitLines(lastCopied.text[i]));
+        }
+      } else if (textLines.length == sel.ranges.length) {
+        multiPaste = map(textLines, function(l) { return [l]; });
+      }
+    }
+
+    // Normal behavior is to insert the new text into every selection
+    for (var i = sel.ranges.length - 1; i >= 0; i--) {
+      var range = sel.ranges[i];
+      var from = range.from(), to = range.to();
+      if (range.empty()) {
+        if (deleted && deleted > 0) // Handle deletion
+          from = Pos(from.line, from.ch - deleted);
+        else if (cm.state.overwrite && !paste) // Handle overwrite
+          to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
+        else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
+          from = to = Pos(from.line, 0)
+      }
+      var updateInput = cm.curOp.updateInput;
+      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
+                         origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
+      makeChange(cm.doc, changeEvent);
+      signalLater(cm, "inputRead", cm, changeEvent);
+    }
+    if (inserted && !paste)
+      triggerElectric(cm, inserted);
+
+    ensureCursorVisible(cm);
+    cm.curOp.updateInput = updateInput;
+    cm.curOp.typing = true;
+    cm.state.pasteIncoming = cm.state.cutIncoming = false;
+  }
+
+  function handlePaste(e, cm) {
+    var pasted = e.clipboardData && e.clipboardData.getData("text/plain");
+    if (pasted) {
+      e.preventDefault();
+      if (!cm.isReadOnly() && !cm.options.disableInput)
+        runInOp(cm, function() { applyTextInput(cm, pasted, 0, null, "paste"); });
+      return true;
+    }
+  }
+
+  function triggerElectric(cm, inserted) {
+    // When an 'electric' character is inserted, immediately trigger a reindent
+    if (!cm.options.electricChars || !cm.options.smartIndent) return;
+    var sel = cm.doc.sel;
+
+    for (var i = sel.ranges.length - 1; i >= 0; i--) {
+      var range = sel.ranges[i];
+      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) continue;
+      var mode = cm.getModeAt(range.head);
+      var indented = false;
+      if (mode.electricChars) {
+        for (var j = 0; j < mode.electricChars.length; j++)
+          if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
+            indented = indentLine(cm, range.head.line, "smart");
+            break;
+          }
+      } else if (mode.electricInput) {
+        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
+          indented = indentLine(cm, range.head.line, "smart");
+      }
+      if (indented) signalLater(cm, "electricInput", cm, range.head.line);
+    }
+  }
+
+  function copyableRanges(cm) {
+    var text = [], ranges = [];
+    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
+      var line = cm.doc.sel.ranges[i].head.line;
+      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
+      ranges.push(lineRange);
+      text.push(cm.getRange(lineRange.anchor, lineRange.head));
+    }
+    return {text: text, ranges: ranges};
+  }
+
+  function disableBrowserMagic(field) {
+    field.setAttribute("autocorrect", "off");
+    field.setAttribute("autocapitalize", "off");
+    field.setAttribute("spellcheck", "false");
+  }
+
+  // TEXTAREA INPUT STYLE
+
+  function TextareaInput(cm) {
+    this.cm = cm;
+    // See input.poll and input.reset
+    this.prevInput = "";
+
+    // Flag that indicates whether we expect input to appear real soon
+    // now (after some event like 'keypress' or 'input') and are
+    // polling intensively.
+    this.pollingFast = false;
+    // Self-resetting timeout for the poller
+    this.polling = new Delayed();
+    // Tracks when input.reset has punted to just putting a short
+    // string into the textarea instead of the full selection.
+    this.inaccurateSelection = false;
+    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
+    this.hasSelection = false;
+    this.composing = null;
+  };
+
+  function hiddenTextarea() {
+    var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
+    var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The textarea is kept positioned near the cursor to prevent the
+    // fact that it'll be scrolled into view on input from scrolling
+    // our fake cursor out of view. On webkit, when wrap=off, paste is
+    // very slow. So make the area wide instead.
+    if (webkit) te.style.width = "1000px";
+    else te.setAttribute("wrap", "off");
+    // If border: 0; -- iOS fails to open keyboard (issue #1287)
+    if (ios) te.style.border = "1px solid black";
+    disableBrowserMagic(te);
+    return div;
+  }
+
+  TextareaInput.prototype = copyObj({
+    init: function(display) {
+      var input = this, cm = this.cm;
+
+      // Wraps and hides input textarea
+      var div = this.wrapper = hiddenTextarea();
+      // The semihidden textarea that is focused when the editor is
+      // focused, and receives input.
+      var te = this.textarea = div.firstChild;
+      display.wrapper.insertBefore(div, display.wrapper.firstChild);
+
+      // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
+      if (ios) te.style.width = "0px";
+
+      on(te, "input", function() {
+        if (ie && ie_version >= 9 && input.hasSelection) input.hasSelection = null;
+        input.poll();
+      });
+
+      on(te, "paste", function(e) {
+        if (signalDOMEvent(cm, e) || handlePaste(e, cm)) return
+
+        cm.state.pasteIncoming = true;
+        input.fastPoll();
+      });
+
+      function prepareCopyCut(e) {
+        if (signalDOMEvent(cm, e)) return
+        if (cm.somethingSelected()) {
+          lastCopied = {lineWise: false, text: cm.getSelections()};
+          if (input.inaccurateSelection) {
+            input.prevInput = "";
+            input.inaccurateSelection = false;
+            te.value = lastCopied.text.join("\n");
+            selectInput(te);
+          }
+        } else if (!cm.options.lineWiseCopyCut) {
+          return;
+        } else {
+          var ranges = copyableRanges(cm);
+          lastCopied = {lineWise: true, text: ranges.text};
+          if (e.type == "cut") {
+            cm.setSelections(ranges.ranges, null, sel_dontScroll);
+          } else {
+            input.prevInput = "";
+            te.value = ranges.text.join("\n");
+            selectInput(te);
+          }
+        }
+        if (e.type == "cut") cm.state.cutIncoming = true;
+      }
+      on(te, "cut", prepareCopyCut);
+      on(te, "copy", prepareCopyCut);
+
+      on(display.scroller, "paste", function(e) {
+        if (eventInWidget(display, e) || signalDOMEvent(cm, e)) return;
+        cm.state.pasteIncoming = true;
+        input.focus();
+      });
+
+      // Prevent normal selection in the editor (we handle our own)
+      on(display.lineSpace, "selectstart", function(e) {
+        if (!eventInWidget(display, e)) e_preventDefault(e);
+      });
+
+      on(te, "compositionstart", function() {
+        var start = cm.getCursor("from");
+        if (input.composing) input.composing.range.clear()
+        input.composing = {
+          start: start,
+          range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
+        };
+      });
+      on(te, "compositionend", function() {
+        if (input.composing) {
+          input.poll();
+          input.composing.range.clear();
+          input.composing = null;
+        }
+      });
+    },
+
+    prepareSelection: function() {
+      // Redraw the selection and/or cursor
+      var cm = this.cm, display = cm.display, doc = cm.doc;
+      var result = prepareSelection(cm);
+
+      // Move the hidden textarea near the cursor to prevent scrolling artifacts
+      if (cm.options.moveInputWithCursor) {
+        var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
+        var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
+        result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
+                                            headPos.top + lineOff.top - wrapOff.top));
+        result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
+                                             headPos.left + lineOff.left - wrapOff.left));
+      }
+
+      return result;
+    },
+
+    showSelection: function(drawn) {
+      var cm = this.cm, display = cm.display;
+      removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
+      removeChildrenAndAdd(display.selectionDiv, drawn.selection);
+      if (drawn.teTop != null) {
+        this.wrapper.style.top = drawn.teTop + "px";
+        this.wrapper.style.left = drawn.teLeft + "px";
+      }
+    },
+
+    // Reset the input to correspond to the selection (or to be empty,
+    // when not typing and nothing is selected)
+    reset: function(typing) {
+      if (this.contextMenuPending) return;
+      var minimal, selected, cm = this.cm, doc = cm.doc;
+      if (cm.somethingSelected()) {
+        this.prevInput = "";
+        var range = doc.sel.primary();
+        minimal = hasCopyEvent &&
+          (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
+        var content = minimal ? "-" : selected || cm.getSelection();
+        this.textarea.value = content;
+        if (cm.state.focused) selectInput(this.textarea);
+        if (ie && ie_version >= 9) this.hasSelection = content;
+      } else if (!typing) {
+        this.prevInput = this.textarea.value = "";
+        if (ie && ie_version >= 9) this.hasSelection = null;
+      }
+      this.inaccurateSelection = minimal;
+    },
+
+    getField: function() { return this.textarea; },
+
+    supportsTouch: function() { return false; },
+
+    focus: function() {
+      if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
+        try { this.textarea.focus(); }
+        catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
+      }
+    },
+
+    blur: function() { this.textarea.blur(); },
+
+    resetPosition: function() {
+      this.wrapper.style.top = this.wrapper.style.left = 0;
+    },
+
+    receivedFocus: function() { this.slowPoll(); },
+
+    // Poll for input changes, using the normal rate of polling. This
+    // runs as long as the editor is focused.
+    slowPoll: function() {
+      var input = this;
+      if (input.pollingFast) return;
+      input.polling.set(this.cm.options.pollInterval, function() {
+        input.poll();
+        if (input.cm.state.focused) input.slowPoll();
+      });
+    },
+
+    // When an event has just come in that is likely to add or change
+    // something in the input textarea, we poll faster, to ensure that
+    // the change appears on the screen quickly.
+    fastPoll: function() {
+      var missed = false, input = this;
+      input.pollingFast = true;
+      function p() {
+        var changed = input.poll();
+        if (!changed && !missed) {missed = true; input.polling.set(60, p);}
+        else {input.pollingFast = false; input.slowPoll();}
+      }
+      input.polling.set(20, p);
+    },
+
+    // Read input from the textarea, and update the document to match.
+    // When something is selected, it is present in the textarea, and
+    // selected (unless it is huge, in which case a placeholder is
+    // used). When nothing is selected, the cursor sits after previously
+    // seen text (can be empty), which is stored in prevInput (we must
+    // not reset the textarea when typing, because that breaks IME).
+    poll: function() {
+      var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
+      // Since this is called a *lot*, try to bail out as cheaply as
+      // possible when it is clear that nothing happened. hasSelection
+      // will be the case when there is a lot of text in the textarea,
+      // in which case reading its value would be expensive.
+      if (this.contextMenuPending || !cm.state.focused ||
+          (hasSelection(input) && !prevInput && !this.composing) ||
+          cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
+        return false;
+
+      var text = input.value;
+      // If nothing changed, bail.
+      if (text == prevInput && !cm.somethingSelected()) return false;
+      // Work around nonsensical selection resetting in IE9/10, and
+      // inexplicable appearance of private area unicode characters on
+      // some key combos in Mac (#2689).
+      if (ie && ie_version >= 9 && this.hasSelection === text ||
+          mac && /[\uf700-\uf7ff]/.test(text)) {
+        cm.display.input.reset();
+        return false;
+      }
+
+      if (cm.doc.sel == cm.display.selForContextMenu) {
+        var first = text.charCodeAt(0);
+        if (first == 0x200b && !prevInput) prevInput = "\u200b";
+        if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo"); }
+      }
+      // Find the part of the input that is actually new
+      var same = 0, l = Math.min(prevInput.length, text.length);
+      while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
+
+      var self = this;
+      runInOp(cm, function() {
+        applyTextInput(cm, text.slice(same), prevInput.length - same,
+                       null, self.composing ? "*compose" : null);
+
+        // Don't leave long text in the textarea, since it makes further polling slow
+        if (text.length > 1000 || text.indexOf("\n") > -1) input.value = self.prevInput = "";
+        else self.prevInput = text;
+
+        if (self.composing) {
+          self.composing.range.clear();
+          self.composing.range = cm.markText(self.composing.start, cm.getCursor("to"),
+                                             {className: "CodeMirror-composing"});
+        }
+      });
+      return true;
+    },
+
+    ensurePolled: function() {
+      if (this.pollingFast && this.poll()) this.pollingFast = false;
+    },
+
+    onKeyPress: function() {
+      if (ie && ie_version >= 9) this.hasSelection = null;
+      this.fastPoll();
+    },
+
+    onContextMenu: function(e) {
+      var input = this, cm = input.cm, display = cm.display, te = input.textarea;
+      var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
+      if (!pos || presto) return; // Opera is difficult.
+
+      // Reset the current text selection only if the click is done outside of the selection
+      // and 'resetSelectionOnContextMenu' option is true.
+      var reset = cm.options.resetSelectionOnContextMenu;
+      if (reset && cm.doc.sel.contains(pos) == -1)
+        operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
+
+      var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
+      input.wrapper.style.cssText = "position: absolute"
+      var wrapperBox = input.wrapper.getBoundingClientRect()
+      te.style.cssText = "position: absolute; width: 30px; height: 30px; top: " + (e.clientY - wrapperBox.top - 5) +
+        "px; left: " + (e.clientX - wrapperBox.left - 5) + "px; z-index: 1000; background: " +
+        (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
+        "; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
+      if (webkit) var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
+      display.input.focus();
+      if (webkit) window.scrollTo(null, oldScrollY);
+      display.input.reset();
+      // Adds "Select all" to context menu in FF
+      if (!cm.somethingSelected()) te.value = input.prevInput = " ";
+      input.contextMenuPending = true;
+      display.selForContextMenu = cm.doc.sel;
+      clearTimeout(display.detectingSelectAll);
+
+      // Select-all will be greyed out if there's nothing to select, so
+      // this adds a zero-width space so that we can later check whether
+      // it got selected.
+      function prepareSelectAllHack() {
+        if (te.selectionStart != null) {
+          var selected = cm.somethingSelected();
+          var extval = "\u200b" + (selected ? te.value : "");
+          te.value = "\u21da"; // Used to catch context-menu undo
+          te.value = extval;
+          input.prevInput = selected ? "" : "\u200b";
+          te.selectionStart = 1; te.selectionEnd = extval.length;
+          // Re-set this, in case some other handler touched the
+          // selection in the meantime.
+          display.selForContextMenu = cm.doc.sel;
+        }
+      }
+      function rehide() {
+        input.contextMenuPending = false;
+        input.wrapper.style.cssText = oldWrapperCSS
+        te.style.cssText = oldCSS;
+        if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
+
+        // Try to detect the user choosing select-all
+        if (te.selectionStart != null) {
+          if (!ie || (ie && ie_version < 9)) prepareSelectAllHack();
+          var i = 0, poll = function() {
+            if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
+                te.selectionEnd > 0 && input.prevInput == "\u200b")
+              operation(cm, commands.selectAll)(cm);
+            else if (i++ < 10) display.detectingSelectAll = setTimeout(poll, 500);
+            else display.input.reset();
+          };
+          display.detectingSelectAll = setTimeout(poll, 200);
+        }
+      }
+
+      if (ie && ie_version >= 9) prepareSelectAllHack();
+      if (captureRightClick) {
+        e_stop(e);
+        var mouseup = function() {
+          off(window, "mouseup", mouseup);
+          setTimeout(rehide, 20);
+        };
+        on(window, "mouseup", mouseup);
+      } else {
+        setTimeout(rehide, 50);
+      }
+    },
+
+    readOnlyChanged: function(val) {
+      if (!val) this.reset();
+    },
+
+    setUneditable: nothing,
+
+    needsContentAttribute: false
+  }, TextareaInput.prototype);
+
+  // CONTENTEDITABLE INPUT STYLE
+
+  function ContentEditableInput(cm) {
+    this.cm = cm;
+    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
+    this.polling = new Delayed();
+    this.gracePeriod = false;
+  }
+
+  ContentEditableInput.prototype = copyObj({
+    init: function(display) {
+      var input = this, cm = input.cm;
+      var div = input.div = display.lineDiv;
+      disableBrowserMagic(div);
+
+      on(div, "paste", function(e) {
+        if (!signalDOMEvent(cm, e)) handlePaste(e, cm);
+      })
+
+      on(div, "compositionstart", function(e) {
+        var data = e.data;
+        input.composing = {sel: cm.doc.sel, data: data, startData: data};
+        if (!data) return;
+        var prim = cm.doc.sel.primary();
+        var line = cm.getLine(prim.head.line);
+        var found = line.indexOf(data, Math.max(0, prim.head.ch - data.length));
+        if (found > -1 && found <= prim.head.ch)
+          input.composing.sel = simpleSelection(Pos(prim.head.line, found),
+                                                Pos(prim.head.line, found + data.length));
+      });
+      on(div, "compositionupdate", function(e) {
+        input.composing.data = e.data;
+      });
+      on(div, "compositionend", function(e) {
+        var ours = input.composing;
+        if (!ours) return;
+        if (e.data != ours.startData && !/\u200b/.test(e.data))
+          ours.data = e.data;
+        // Need a small delay to prevent other code (input event,
+        // selection polling) from doing damage when fired right after
+        // compositionend.
+        setTimeout(function() {
+          if (!ours.handled)
+            input.applyComposition(ours);
+          if (input.composing == ours)
+            input.composing = null;
+        }, 50);
+      });
+
+      on(div, "touchstart", function() {
+        input.forceCompositionEnd();
+      });
+
+      on(div, "input", function() {
+        if (input.composing) return;
+        if (cm.isReadOnly() || !input.pollContent())
+          runInOp(input.cm, function() {regChange(cm);});
+      });
+
+      function onCopyCut(e) {
+        if (signalDOMEvent(cm, e)) return
+        if (cm.somethingSelected()) {
+          lastCopied = {lineWise: false, text: cm.getSelections()};
+          if (e.type == "cut") cm.replaceSelection("", null, "cut");
+        } else if (!cm.options.lineWiseCopyCut) {
+          return;
+        } else {
+          var ranges = copyableRanges(cm);
+          lastCopied = {lineWise: true, text: ranges.text};
+          if (e.type == "cut") {
+            cm.operation(function() {
+              cm.setSelections(ranges.ranges, 0, sel_dontScroll);
+              cm.replaceSelection("", null, "cut");
+            });
+          }
+        }
+        // iOS exposes the clipboard API, but seems to discard content inserted into it
+        if (e.clipboardData && !ios) {
+          e.preventDefault();
+          e.clipboardData.clearData();
+          e.clipboardData.setData("text/plain", lastCopied.text.join("\n"));
+        } else {
+          // Old-fashioned briefly-focus-a-textarea hack
+          var kludge = hiddenTextarea(), te = kludge.firstChild;
+          cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
+          te.value = lastCopied.text.join("\n");
+          var hadFocus = document.activeElement;
+          selectInput(te);
+          setTimeout(function() {
+            cm.display.lineSpace.removeChild(kludge);
+            hadFocus.focus();
+          }, 50);
+        }
+      }
+      on(div, "copy", onCopyCut);
+      on(div, "cut", onCopyCut);
+    },
+
+    prepareSelection: function() {
+      var result = prepareSelection(this.cm, false);
+      result.focus = this.cm.state.focused;
+      return result;
+    },
+
+    showSelection: function(info, takeFocus) {
+      if (!info || !this.cm.display.view.length) return;
+      if (info.focus || takeFocus) this.showPrimarySelection();
+      this.showMultipleSelections(info);
+    },
+
+    showPrimarySelection: function() {
+      var sel = window.getSelection(), prim = this.cm.doc.sel.primary();
+      var curAnchor = domToPos(this.cm, sel.anchorNode, sel.anchorOffset);
+      var curFocus = domToPos(this.cm, sel.focusNode, sel.focusOffset);
+      if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
+          cmp(minPos(curAnchor, curFocus), prim.from()) == 0 &&
+          cmp(maxPos(curAnchor, curFocus), prim.to()) == 0)
+        return;
+
+      var start = posToDOM(this.cm, prim.from());
+      var end = posToDOM(this.cm, prim.to());
+      if (!start && !end) return;
+
+      var view = this.cm.display.view;
+      var old = sel.rangeCount && sel.getRangeAt(0);
+      if (!start) {
+        start = {node: view[0].measure.map[2], offset: 0};
+      } else if (!end) { // FIXME dangerously hacky
+        var measure = view[view.length - 1].measure;
+        var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
+        end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
+      }
+
+      try { var rng = range(start.node, start.offset, end.offset, end.node); }
+      catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
+      if (rng) {
+        if (!gecko && this.cm.state.focused) {
+          sel.collapse(start.node, start.offset);
+          if (!rng.collapsed) sel.addRange(rng);
+        } else {
+          sel.removeAllRanges();
+          sel.addRange(rng);
+        }
+        if (old && sel.anchorNode == null) sel.addRange(old);
+        else if (gecko) this.startGracePeriod();
+      }
+      this.rememberSelection();
+    },
+
+    startGracePeriod: function() {
+      var input = this;
+      clearTimeout(this.gracePeriod);
+      this.gracePeriod = setTimeout(function() {
+        input.gracePeriod = false;
+        if (input.selectionChanged())
+          input.cm.operation(function() { input.cm.curOp.selectionChanged = true; });
+      }, 20);
+    },
+
+    showMultipleSelections: function(info) {
+      removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
+      removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
+    },
+
+    rememberSelection: function() {
+      var sel = window.getSelection();
+      this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
+      this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
+    },
+
+    selectionInEditor: function() {
+      var sel = window.getSelection();
+      if (!sel.rangeCount) return false;
+      var node = sel.getRangeAt(0).commonAncestorContainer;
+      return contains(this.div, node);
+    },
+
+    focus: function() {
+      if (this.cm.options.readOnly != "nocursor") this.div.focus();
+    },
+    blur: function() { this.div.blur(); },
+    getField: function() { return this.div; },
+
+    supportsTouch: function() { return true; },
+
+    receivedFocus: function() {
+      var input = this;
+      if (this.selectionInEditor())
+        this.pollSelection();
+      else
+        runInOp(this.cm, function() { input.cm.curOp.selectionChanged = true; });
+
+      function poll() {
+        if (input.cm.state.focused) {
+          input.pollSelection();
+          input.polling.set(input.cm.options.pollInterval, poll);
+        }
+      }
+      this.polling.set(this.cm.options.pollInterval, poll);
+    },
+
+    selectionChanged: function() {
+      var sel = window.getSelection();
+      return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
+        sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset;
+    },
+
+    pollSelection: function() {
+      if (!this.composing && !this.gracePeriod && this.selectionChanged()) {
+        var sel = window.getSelection(), cm = this.cm;
+        this.rememberSelection();
+        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
+        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
+        if (anchor && head) runInOp(cm, function() {
+          setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
+          if (anchor.bad || head.bad) cm.curOp.selectionChanged = true;
+        });
+      }
+    },
+
+    pollContent: function() {
+      var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
+      var from = sel.from(), to = sel.to();
+      if (from.line < display.viewFrom || to.line > display.viewTo - 1) return false;
+
+      var fromIndex;
+      if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
+        var fromLine = lineNo(display.view[0].line);
+        var fromNode = display.view[0].node;
+      } else {
+        var fromLine = lineNo(display.view[fromIndex].line);
+        var fromNode = display.view[fromIndex - 1].node.nextSibling;
+      }
+      var toIndex = findViewIndex(cm, to.line);
+      if (toIndex == display.view.length - 1) {
+        var toLine = display.viewTo - 1;
+        var toNode = display.lineDiv.lastChild;
+      } else {
+        var toLine = lineNo(display.view[toIndex + 1].line) - 1;
+        var toNode = display.view[toIndex + 1].node.previousSibling;
+      }
+
+      var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
+      var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
+      while (newText.length > 1 && oldText.length > 1) {
+        if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
+        else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
+        else break;
+      }
+
+      var cutFront = 0, cutEnd = 0;
+      var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
+      while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
+        ++cutFront;
+      var newBot = lst(newText), oldBot = lst(oldText);
+      var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
+                               oldBot.length - (oldText.length == 1 ? cutFront : 0));
+      while (cutEnd < maxCutEnd &&
+             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
+        ++cutEnd;
+
+      newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd);
+      newText[0] = newText[0].slice(cutFront);
+
+      var chFrom = Pos(fromLine, cutFront);
+      var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
+      if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
+        replaceRange(cm.doc, newText, chFrom, chTo, "+input");
+        return true;
+      }
+    },
+
+    ensurePolled: function() {
+      this.forceCompositionEnd();
+    },
+    reset: function() {
+      this.forceCompositionEnd();
+    },
+    forceCompositionEnd: function() {
+      if (!this.composing || this.composing.handled) return;
+      this.applyComposition(this.composing);
+      this.composing.handled = true;
+      this.div.blur();
+      this.div.focus();
+    },
+    applyComposition: function(composing) {
+      if (this.cm.isReadOnly())
+        operation(this.cm, regChange)(this.cm)
+      else if (composing.data && composing.data != composing.startData)
+        operation(this.cm, applyTextInput)(this.cm, composing.data, 0, composing.sel);
+    },
+
+    setUneditable: function(node) {
+      node.contentEditable = "false"
+    },
+
+    onKeyPress: function(e) {
+      e.preventDefault();
+      if (!this.cm.isReadOnly())
+        operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
+    },
+
+    readOnlyChanged: function(val) {
+      this.div.contentEditable = String(val != "nocursor")
+    },
+
+    onContextMenu: nothing,
+    resetPosition: nothing,
+
+    needsContentAttribute: true
+  }, ContentEditableInput.prototype);
+
+  function posToDOM(cm, pos) {
+    var view = findViewForLine(cm, pos.line);
+    if (!view || view.hidden) return null;
+    var line = getLine(cm.doc, pos.line);
+    var info = mapFromLineView(view, line, pos.line);
+
+    var order = getOrder(line), side = "left";
+    if (order) {
+      var partPos = getBidiPartAt(order, pos.ch);
+      side = partPos % 2 ? "right" : "left";
+    }
+    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
+    result.offset = result.collapse == "right" ? result.end : result.start;
+    return result;
+  }
+
+  function badPos(pos, bad) { if (bad) pos.bad = true; return pos; }
+
+  function domToPos(cm, node, offset) {
+    var lineNode;
+    if (node == cm.display.lineDiv) {
+      lineNode = cm.display.lineDiv.childNodes[offset];
+      if (!lineNode) return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true);
+      node = null; offset = 0;
+    } else {
+      for (lineNode = node;; lineNode = lineNode.parentNode) {
+        if (!lineNode || lineNode == cm.display.lineDiv) return null;
+        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) break;
+      }
+    }
+    for (var i = 0; i < cm.display.view.length; i++) {
+      var lineView = cm.display.view[i];
+      if (lineView.node == lineNode)
+        return locateNodeInLineView(lineView, node, offset);
+    }
+  }
+
+  function locateNodeInLineView(lineView, node, offset) {
+    var wrapper = lineView.text.firstChild, bad = false;
+    if (!node || !contains(wrapper, node)) return badPos(Pos(lineNo(lineView.line), 0), true);
+    if (node == wrapper) {
+      bad = true;
+      node = wrapper.childNodes[offset];
+      offset = 0;
+      if (!node) {
+        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
+        return badPos(Pos(lineNo(line), line.text.length), bad);
+      }
+    }
+
+    var textNode = node.nodeType == 3 ? node : null, topNode = node;
+    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
+      textNode = node.firstChild;
+      if (offset) offset = textNode.nodeValue.length;
+    }
+    while (topNode.parentNode != wrapper) topNode = topNode.parentNode;
+    var measure = lineView.measure, maps = measure.maps;
+
+    function find(textNode, topNode, offset) {
+      for (var i = -1; i < (maps ? maps.length : 0); i++) {
+        var map = i < 0 ? measure.map : maps[i];
+        for (var j = 0; j < map.length; j += 3) {
+          var curNode = map[j + 2];
+          if (curNode == textNode || curNode == topNode) {
+            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
+            var ch = map[j] + offset;
+            if (offset < 0 || curNode != textNode) ch = map[j + (offset ? 1 : 0)];
+            return Pos(line, ch);
+          }
+        }
+      }
+    }
+    var found = find(textNode, topNode, offset);
+    if (found) return badPos(found, bad);
+
+    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
+    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
+      found = find(after, after.firstChild, 0);
+      if (found)
+        return badPos(Pos(found.line, found.ch - dist), bad);
+      else
+        dist += after.textContent.length;
+    }
+    for (var before = topNode.previousSibling, dist = offset; before; before = before.previousSibling) {
+      found = find(before, before.firstChild, -1);
+      if (found)
+        return badPos(Pos(found.line, found.ch + dist), bad);
+      else
+        dist += after.textContent.length;
+    }
+  }
+
+  function domTextBetween(cm, from, to, fromLine, toLine) {
+    var text = "", closing = false, lineSep = cm.doc.lineSeparator();
+    function recognizeMarker(id) { return function(marker) { return marker.id == id; }; }
+    function walk(node) {
+      if (node.nodeType == 1) {
+        var cmText = node.getAttribute("cm-text");
+        if (cmText != null) {
+          if (cmText == "") cmText = node.textContent.replace(/\u200b/g, "");
+          text += cmText;
+          return;
+        }
+        var markerID = node.getAttribute("cm-marker"), range;
+        if (markerID) {
+          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
+          if (found.length && (range = found[0].find()))
+            text += getBetween(cm.doc, range.from, range.to).join(lineSep);
+          return;
+        }
+        if (node.getAttribute("contenteditable") == "false") return;
+        for (var i = 0; i < node.childNodes.length; i++)
+          walk(node.childNodes[i]);
+        if (/^(pre|div|p)$/i.test(node.nodeName))
+          closing = true;
+      } else if (node.nodeType == 3) {
+        var val = node.nodeValue;
+        if (!val) return;
+        if (closing) {
+          text += lineSep;
+          closing = false;
+        }
+        text += val;
+      }
+    }
+    for (;;) {
+      walk(from);
+      if (from == to) break;
+      from = from.nextSibling;
+    }
+    return text;
+  }
+
+  CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};
+
   // SELECTION / CURSOR
 
   // Selection objects are immutable. A new one is created every time
   // the selection changes. A selection is one or more non-overlapping
   // (and non-touching) ranges, sorted, and an integer that indicates
   // which one is the primary selection (the one that's scrolled into
   // view, that getCursor returns, etc).
   function Selection(ranges, primIndex) {
     this.ranges = ranges;
     this.primIndex = primIndex;
@@ skipping 136 matching lines @@
     setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
   }
 
   // Reset the selection to a single range.
   function setSimpleSelection(doc, anchor, head, options) {
     setSelection(doc, simpleSelection(anchor, head), options);
   }
 
   // Give beforeSelectionChange handlers a change to influence a
   // selection update.
-  function filterSelectionChange(doc, sel) {
+  function filterSelectionChange(doc, sel, options) {
     var obj = {
       ranges: sel.ranges,
       update: function(ranges) {
         this.ranges = [];
         for (var i = 0; i < ranges.length; i++)
           this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                                      clipPos(doc, ranges[i].head));
-      }
+      },
+      origin: options && options.origin
     };
     signal(doc, "beforeSelectionChange", doc, obj);
     if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
     if (obj.ranges != sel.ranges) return normalizeSelection(obj.ranges, obj.ranges.length - 1);
     else return sel;
   }
 
   function setSelectionReplaceHistory(doc, sel, options) {
     var done = doc.history.done, last = lst(done);
     if (last && last.ranges) {
       done[done.length - 1] = sel;
       setSelectionNoUndo(doc, sel, options);
     } else {
       setSelection(doc, sel, options);
     }
   }
 
   // Set a new selection.
   function setSelection(doc, sel, options) {
     setSelectionNoUndo(doc, sel, options);
     addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
   }
 
   function setSelectionNoUndo(doc, sel, options) {
     if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
-      sel = filterSelectionChange(doc, sel);
+      sel = filterSelectionChange(doc, sel, options);
 
     var bias = options && options.bias ||
       (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
     setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
 
     if (!(options && options.scroll === false) && doc.cm)
       ensureCursorVisible(doc.cm);
   }
 
   function setSelectionInner(doc, sel) {
@@ skipping 13 matching lines @@
   function reCheckSelection(doc) {
     setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
   }
 
   // Return a selection that does not partially select any atomic
   // ranges.
   function skipAtomicInSelection(doc, sel, bias, mayClear) {
     var out;
     for (var i = 0; i < sel.ranges.length; i++) {
       var range = sel.ranges[i];
-      var newAnchor = skipAtomic(doc, range.anchor, bias, mayClear);
-      var newHead = skipAtomic(doc, range.head, bias, mayClear);
+      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
+      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
+      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
       if (out || newAnchor != range.anchor || newHead != range.head) {
         if (!out) out = sel.ranges.slice(0, i);
         out[i] = new Range(newAnchor, newHead);
       }
     }
     return out ? normalizeSelection(out, sel.primIndex) : sel;
   }
 
-  // Ensure a given position is not inside an atomic range.
-  function skipAtomic(doc, pos, bias, mayClear) {
-    var flipped = false, curPos = pos;
-    var dir = bias || 1;
-    doc.cantEdit = false;
-    search: for (;;) {
-      var line = getLine(doc, curPos.line);
-      if (line.markedSpans) {
-        for (var i = 0; i < line.markedSpans.length; ++i) {
-          var sp = line.markedSpans[i], m = sp.marker;
-          if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
-              (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
-            if (mayClear) {
-              signal(m, "beforeCursorEnter");
-              if (m.explicitlyCleared) {
-                if (!line.markedSpans) break;
-                else {--i; continue;}
-              }
-            }
-            if (!m.atomic) continue;
-            var newPos = m.find(dir < 0 ? -1 : 1);
-            if (cmp(newPos, curPos) == 0) {
-              newPos.ch += dir;
-              if (newPos.ch < 0) {
-                if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
-                else newPos = null;
-              } else if (newPos.ch > line.text.length) {
-                if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
-                else newPos = null;
-              }
-              if (!newPos) {
-                if (flipped) {
-                  // Driven in a corner -- no valid cursor position found at all
-                  // -- try again *with* clearing, if we didn't already
-                  if (!mayClear) return skipAtomic(doc, pos, bias, true);
-                  // Otherwise, turn off editing until further notice, and return the start of the doc
-                  doc.cantEdit = true;
-                  return Pos(doc.first, 0);
-                }
-                flipped = true; newPos = pos; dir = -dir;
-              }
-            }
-            curPos = newPos;
-            continue search;
+  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
+    var line = getLine(doc, pos.line);
+    if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
+      var sp = line.markedSpans[i], m = sp.marker;
+      if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
+          (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
+        if (mayClear) {
+          signal(m, "beforeCursorEnter");
+          if (m.explicitlyCleared) {
+            if (!line.markedSpans) break;
+            else {--i; continue;}
           }
         }
+        if (!m.atomic) continue;
+
+        if (oldPos) {
+          var near = m.find(dir < 0 ? 1 : -1), diff;
+          if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)
+            near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null);
+          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
+            return skipAtomicInner(doc, near, pos, dir, mayClear);
+        }
+
+        var far = m.find(dir < 0 ? -1 : 1);
+        if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)
+          far = movePos(doc, far, dir, far.line == pos.line ? line : null);
+        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null;
       }
-      return curPos;
+    }
+    return pos;
+  }
+
+  // Ensure a given position is not inside an atomic range.
+  function skipAtomic(doc, pos, oldPos, bias, mayClear) {
+    var dir = bias || 1;
+    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
+        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
+        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
+        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
+    if (!found) {
+      doc.cantEdit = true;
+      return Pos(doc.first, 0);
+    }
+    return found;
+  }
+
+  function movePos(doc, pos, dir, line) {
+    if (dir < 0 && pos.ch == 0) {
+      if (pos.line > doc.first) return clipPos(doc, Pos(pos.line - 1));
+      else return null;
+    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
+      if (pos.line < doc.first + doc.size - 1) return Pos(pos.line + 1, 0);
+      else return null;
+    } else {
+      return new Pos(pos.line, pos.ch + dir);
     }
   }
 
   // SELECTION DRAWING
 
-  // Redraw the selection and/or cursor
-  function drawSelection(cm) {
-    var display = cm.display, doc = cm.doc, result = {};
+  function updateSelection(cm) {
+    cm.display.input.showSelection(cm.display.input.prepareSelection());
+  }
+
+  function prepareSelection(cm, primary) {
+    var doc = cm.doc, result = {};
     var curFragment = result.cursors = document.createDocumentFragment();
     var selFragment = result.selection = document.createDocumentFragment();
 
     for (var i = 0; i < doc.sel.ranges.length; i++) {
+      if (primary === false && i == doc.sel.primIndex) continue;
       var range = doc.sel.ranges[i];
+      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) continue;
       var collapsed = range.empty();
       if (collapsed || cm.options.showCursorWhenSelecting)
-        drawSelectionCursor(cm, range, curFragment);
+        drawSelectionCursor(cm, range.head, curFragment);
       if (!collapsed)
         drawSelectionRange(cm, range, selFragment);
     }
-
-    // Move the hidden textarea near the cursor to prevent scrolling artifacts
-    if (cm.options.moveInputWithCursor) {
-      var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
-      var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
-      result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
-                                          headPos.top + lineOff.top - wrapOff.top));
-      result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
-                                           headPos.left + lineOff.left - wrapOff.left));
-    }
-
     return result;
   }
 
-  function showSelection(cm, drawn) {
-    removeChildrenAndAdd(cm.display.cursorDiv, drawn.cursors);
-    removeChildrenAndAdd(cm.display.selectionDiv, drawn.selection);
-    if (drawn.teTop != null) {
-      cm.display.inputDiv.style.top = drawn.teTop + "px";
-      cm.display.inputDiv.style.left = drawn.teLeft + "px";
-    }
-  }
-
-  function updateSelection(cm) {
-    showSelection(cm, drawSelection(cm));
-  }
-
   // Draws a cursor for the given range
-  function drawSelectionCursor(cm, range, output) {
-    var pos = cursorCoords(cm, range.head, "div", null, null, !cm.options.singleCursorHeightPerLine);
+  function drawSelectionCursor(cm, head, output) {
+    var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);
 
     var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
     cursor.style.left = pos.left + "px";
     cursor.style.top = pos.top + "px";
     cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
 
     if (pos.other) {
       // Secondary cursor, shown when on a 'jump' in bi-directional text
       var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
       otherCursor.style.display = "";
@@ skipping 103 matching lines @@
   function highlightWorker(cm) {
     var doc = cm.doc;
     if (doc.frontier < doc.first) doc.frontier = doc.first;
     if (doc.frontier >= cm.display.viewTo) return;
     var end = +new Date + cm.options.workTime;
     var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
     var changedLines = [];
 
     doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
       if (doc.frontier >= cm.display.viewFrom) { // Visible
-        var oldStyles = line.styles;
-        var highlighted = highlightLine(cm, line, state, true);
+        var oldStyles = line.styles, tooLong = line.text.length > cm.options.maxHighlightLength;
+        var highlighted = highlightLine(cm, line, tooLong ? copyState(doc.mode, state) : state, true);
         line.styles = highlighted.styles;
         var oldCls = line.styleClasses, newCls = highlighted.classes;
         if (newCls) line.styleClasses = newCls;
         else if (oldCls) line.styleClasses = null;
         var ischange = !oldStyles || oldStyles.length != line.styles.length ||
           oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
         for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
         if (ischange) changedLines.push(doc.frontier);
-        line.stateAfter = copyState(doc.mode, state);
+        line.stateAfter = tooLong ? state : copyState(doc.mode, state);
       } else {
-        processLine(cm, line.text, state);
+        if (line.text.length <= cm.options.maxHighlightLength)
+          processLine(cm, line.text, state);
         line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
       }
       ++doc.frontier;
       if (+new Date > end) {
         startWorker(cm, cm.options.workDelay);
         return true;
       }
     });
     if (changedLines.length) runInOp(cm, function() {
       for (var i = 0; i < changedLines.length; i++)
@@ skipping 124 matching lines @@
   }
 
   // Measurement can be split in two steps, the set-up work that
   // applies to the whole line, and the measurement of the actual
   // character. Functions like coordsChar, that need to do a lot of
   // measurements in a row, can thus ensure that the set-up work is
   // only done once.
   function prepareMeasureForLine(cm, line) {
     var lineN = lineNo(line);
     var view = findViewForLine(cm, lineN);
-    if (view && !view.text)
+    if (view && !view.text) {
       view = null;
-    else if (view && view.changes)
+    } else if (view && view.changes) {
       updateLineForChanges(cm, view, lineN, getDimensions(cm));
+      cm.curOp.forceUpdate = true;
+    }
     if (!view)
       view = updateExternalMeasurement(cm, line);
 
     var info = mapFromLineView(view, line, lineN);
     return {
       line: line, view: view, rect: null,
       map: info.map, cache: info.cache, before: info.before,
       hasHeights: false
     };
   }
@@ skipping 15 matching lines @@
       found = measureCharInner(cm, prepared, ch, bias);
       if (!found.bogus) prepared.cache[key] = found;
     }
     return {left: found.left, right: found.right,
             top: varHeight ? found.rtop : found.top,
             bottom: varHeight ? found.rbottom : found.bottom};
   }
 
   var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
 
-  function measureCharInner(cm, prepared, ch, bias) {
-    var map = prepared.map;
-
+  function nodeAndOffsetInLineMap(map, ch, bias) {
     var node, start, end, collapse;
     // First, search the line map for the text node corresponding to,
     // or closest to, the target character.
     for (var i = 0; i < map.length; i += 3) {
       var mStart = map[i], mEnd = map[i + 1];
       if (ch < mStart) {
         start = 0; end = 1;
         collapse = "left";
       } else if (ch < mEnd) {
         start = ch - mStart;
@@ skipping 13 matching lines @@
             collapse = "left";
           }
         if (bias == "right" && start == mEnd - mStart)
           while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
             node = map[(i += 3) + 2];
             collapse = "right";
           }
         break;
       }
     }
+    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd};
+  }
+
+  function getUsefulRect(rects, bias) {
+    var rect = nullRect
+    if (bias == "left") for (var i = 0; i < rects.length; i++) {
+      if ((rect = rects[i]).left != rect.right) break
+    } else for (var i = rects.length - 1; i >= 0; i--) {
+      if ((rect = rects[i]).left != rect.right) break
+    }
+    return rect
+  }
+
+  function measureCharInner(cm, prepared, ch, bias) {
+    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
+    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;
 
     var rect;
     if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
       for (var i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
-        while (start && isExtendingChar(prepared.line.text.charAt(mStart + start))) --start;
-        while (mStart + end < mEnd && isExtendingChar(prepared.line.text.charAt(mStart + end))) ++end;
-        if (ie && ie_version < 9 && start == 0 && end == mEnd - mStart) {
+        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start;
+        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end;
+        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
           rect = node.parentNode.getBoundingClientRect();
-        } else if (ie && cm.options.lineWrapping) {
-          var rects = range(node, start, end).getClientRects();
-          if (rects.length)
-            rect = rects[bias == "right" ? rects.length - 1 : 0];
-          else
-            rect = nullRect;
-        } else {
-          rect = range(node, start, end).getBoundingClientRect() || nullRect;
-        }
+        else
+          rect = getUsefulRect(range(node, start, end).getClientRects(), bias)
         if (rect.left || rect.right || start == 0) break;
         end = start;
         start = start - 1;
         collapse = "right";
       }
       if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect);
     } else { // If it is a widget, simply get the box for the whole widget.
       if (start > 0) collapse = bias = "right";
       var rects;
       if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
@@ skipping 205 matching lines @@
 
     var bidi = getOrder(lineObj), dist = lineObj.text.length;
     var from = lineLeft(lineObj), to = lineRight(lineObj);
     var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
 
     if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
     // Do a binary search between these bounds.
     for (;;) {
       if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
         var ch = x < fromX || x - fromX <= toX - x ? from : to;
+        var outside = ch == from ? fromOutside : toOutside
         var xDiff = x - (ch == from ? fromX : toX);
+        // This is a kludge to handle the case where the coordinates
+        // are after a line-wrapped line. We should replace it with a
+        // more general handling of cursor positions around line
+        // breaks. (Issue #4078)
+        if (toOutside && !bidi && !/\s/.test(lineObj.text.charAt(ch)) && xDiff > 0 &&
+            ch < lineObj.text.length && preparedMeasure.view.measure.heights.length > 1) {
+          var charSize = measureCharPrepared(cm, preparedMeasure, ch, "right");
+          if (innerOff <= charSize.bottom && innerOff >= charSize.top && Math.abs(x - charSize.right) < xDiff) {
+            outside = false
+            ch++
+            xDiff = x - charSize.right
+          }
+        }
         while (isExtendingChar(lineObj.text.charAt(ch))) ++ch;
-        var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
-                              xDiff < -1 ? -1 : xDiff > 1 ? 1 : 0);
+        var pos = PosWithInfo(lineNo, ch, outside, xDiff < -1 ? -1 : xDiff > 1 ? 1 : 0);
         return pos;
       }
       var step = Math.ceil(dist / 2), middle = from + step;
       if (bidi) {
         middle = from;
         for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
       }
       var middleX = getX(middle);
       if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
       else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
@@ skipping 52 matching lines @@
       forceUpdate: false,      // Used to force a redraw
       updateInput: null,       // Whether to reset the input textarea
       typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
       changeObjs: null,        // Accumulated changes, for firing change events
       cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
       cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
       selectionChanged: false, // Whether the selection needs to be redrawn
       updateMaxLine: false,    // Set when the widest line needs to be determined anew
       scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
       scrollToPos: null,       // Used to scroll to a specific position
+      focus: false,
       id: ++nextOpId           // Unique ID
     };
     if (operationGroup) {
       operationGroup.ops.push(cm.curOp);
     } else {
       cm.curOp.ownsGroup = operationGroup = {
         ops: [cm.curOp],
         delayedCallbacks: []
       };
     }
   }
 
   function fireCallbacksForOps(group) {
     // Calls delayed callbacks and cursorActivity handlers until no
     // new ones appear
     var callbacks = group.delayedCallbacks, i = 0;
     do {
       for (; i < callbacks.length; i++)
-        callbacks[i]();
+        callbacks[i].call(null);
       for (var j = 0; j < group.ops.length; j++) {
         var op = group.ops[j];
         if (op.cursorActivityHandlers)
           while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
-            op.cursorActivityHandlers[op.cursorActivityCalled++](op.cm);
+            op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
       }
     } while (i < callbacks.length);
   }
 
   // Finish an operation, updating the display and signalling delayed events
   function endOperation(cm) {
     var op = cm.curOp, group = op.ownsGroup;
     if (!group) return;
 
     try { fireCallbacksForOps(group); }
@@ skipping 49 matching lines @@
     // updateDisplay_W2 will use these properties to do the actual resizing
     if (display.maxLineChanged && !cm.options.lineWrapping) {
       op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
       cm.display.sizerWidth = op.adjustWidthTo;
       op.barMeasure.scrollWidth =
         Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
       op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
     }
 
     if (op.updatedDisplay || op.selectionChanged)
-      op.newSelectionNodes = drawSelection(cm);
+      op.preparedSelection = display.input.prepareSelection(op.focus);
   }
 
   function endOperation_W2(op) {
     var cm = op.cm;
 
     if (op.adjustWidthTo != null) {
       cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
       if (op.maxScrollLeft < cm.doc.scrollLeft)
         setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
       cm.display.maxLineChanged = false;
     }
 
-    if (op.newSelectionNodes)
-      showSelection(cm, op.newSelectionNodes);
+    var takeFocus = op.focus && op.focus == activeElt() && (!document.hasFocus || document.hasFocus())
+    if (op.preparedSelection)
+      cm.display.input.showSelection(op.preparedSelection, takeFocus);
+    if (op.updatedDisplay || op.startHeight != cm.doc.height)
+      updateScrollbars(cm, op.barMeasure);
     if (op.updatedDisplay)
       setDocumentHeight(cm, op.barMeasure);
-    if (op.updatedDisplay || op.startHeight != cm.doc.height)
-      updateScrollbars(cm, op.barMeasure);
 
     if (op.selectionChanged) restartBlink(cm);
 
     if (cm.state.focused && op.updateInput)
-      resetInput(cm, op.typing);
+      cm.display.input.reset(op.typing);
+    if (takeFocus) ensureFocus(op.cm);
   }
 
   function endOperation_finish(op) {
     var cm = op.cm, display = cm.display, doc = cm.doc;
 
     if (op.updatedDisplay) postUpdateDisplay(cm, op.update);
 
     // Abort mouse wheel delta measurement, when scrolling explicitly
     if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
       display.wheelStartX = display.wheelStartY = null;
 
     // Propagate the scroll position to the actual DOM scroller
     if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop || op.forceScroll)) {
       doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
       display.scrollbars.setScrollTop(doc.scrollTop);
       display.scroller.scrollTop = doc.scrollTop;
     }
     if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft || op.forceScroll)) {
-      doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - displayWidth(cm), op.scrollLeft));
+      doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - display.scroller.clientWidth, op.scrollLeft));
       display.scrollbars.setScrollLeft(doc.scrollLeft);
       display.scroller.scrollLeft = doc.scrollLeft;
       alignHorizontally(cm);
     }
     // If we need to scroll a specific position into view, do so.
     if (op.scrollToPos) {
       var coords = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
                                      clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
       if (op.scrollToPos.isCursor && cm.state.focused) maybeScrollWindow(cm, coords);
     }
 
     // Fire events for markers that are hidden/unidden by editing or
     // undoing
     var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
     if (hidden) for (var i = 0; i < hidden.length; ++i)
       if (!hidden[i].lines.length) signal(hidden[i], "hide");
     if (unhidden) for (var i = 0; i < unhidden.length; ++i)
       if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
 
     if (display.wrapper.offsetHeight)
       doc.scrollTop = cm.display.scroller.scrollTop;
 
     // Fire change events, and delayed event handlers
     if (op.changeObjs)
       signal(cm, "changes", cm, op.changeObjs);
+    if (op.update)
+      op.update.finish();
   }
 
   // Run the given function in an operation
   function runInOp(cm, f) {
     if (cm.curOp) return f();
     startOperation(cm);
     try { return f(); }
     finally { endOperation(cm); }
   }
   // Wraps a function in an operation. Returns the wrapped function.
@@ skipping 205 matching lines @@
   // out of date (or nonexistent).
   function countDirtyView(cm) {
     var view = cm.display.view, dirty = 0;
     for (var i = 0; i < view.length; i++) {
       var lineView = view[i];
       if (!lineView.hidden && (!lineView.node || lineView.changes)) ++dirty;
     }
     return dirty;
   }
 
-  // INPUT HANDLING
-
-  // Poll for input changes, using the normal rate of polling. This
-  // runs as long as the editor is focused.
-  function slowPoll(cm) {
-    if (cm.display.pollingFast) return;
-    cm.display.poll.set(cm.options.pollInterval, function() {
-      readInput(cm);
-      if (cm.state.focused) slowPoll(cm);
-    });
-  }
-
-  // When an event has just come in that is likely to add or change
-  // something in the input textarea, we poll faster, to ensure that
-  // the change appears on the screen quickly.
-  function fastPoll(cm) {
-    var missed = false;
-    cm.display.pollingFast = true;
-    function p() {
-      var changed = readInput(cm);
-      if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
-      else {cm.display.pollingFast = false; slowPoll(cm);}
-    }
-    cm.display.poll.set(20, p);
-  }
-
-  // This will be set to an array of strings when copying, so that,
-  // when pasting, we know what kind of selections the copied text
-  // was made out of.
-  var lastCopied = null;
-
-  // Read input from the textarea, and update the document to match.
-  // When something is selected, it is present in the textarea, and
-  // selected (unless it is huge, in which case a placeholder is
-  // used). When nothing is selected, the cursor sits after previously
-  // seen text (can be empty), which is stored in prevInput (we must
-  // not reset the textarea when typing, because that breaks IME).
-  function readInput(cm) {
-    var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc;
-    // Since this is called a *lot*, try to bail out as cheaply as
-    // possible when it is clear that nothing happened. hasSelection
-    // will be the case when there is a lot of text in the textarea,
-    // in which case reading its value would be expensive.
-    if (!cm.state.focused || (hasSelection(input) && !prevInput) || isReadOnly(cm) || cm.options.disableInput || cm.state.keySeq)
-      return false;
-    // See paste handler for more on the fakedLastChar kludge
-    if (cm.state.pasteIncoming && cm.state.fakedLastChar) {
-      input.value = input.value.substring(0, input.value.length - 1);
-      cm.state.fakedLastChar = false;
-    }
-    var text = input.value;
-    // If nothing changed, bail.
-    if (text == prevInput && !cm.somethingSelected()) return false;
-    // Work around nonsensical selection resetting in IE9/10, and
-    // inexplicable appearance of private area unicode characters on
-    // some key combos in Mac (#2689).
-    if (ie && ie_version >= 9 && cm.display.inputHasSelection === text ||
-        mac && /[\uf700-\uf7ff]/.test(text)) {
-      resetInput(cm);
-      return false;
-    }
-
-    var withOp = !cm.curOp;
-    if (withOp) startOperation(cm);
-    cm.display.shift = false;
-
-    if (text.charCodeAt(0) == 0x200b && doc.sel == cm.display.selForContextMenu && !prevInput)
-      prevInput = "\u200b";
-    // Find the part of the input that is actually new
-    var same = 0, l = Math.min(prevInput.length, text.length);
-    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
-    var inserted = text.slice(same), textLines = splitLines(inserted);
-
-    // When pasing N lines into N selections, insert one line per selection
-    var multiPaste = null;
-    if (cm.state.pasteIncoming && doc.sel.ranges.length > 1) {
-      if (lastCopied && lastCopied.join("\n") == inserted)
-        multiPaste = doc.sel.ranges.length % lastCopied.length == 0 && map(lastCopied, splitLines);
-      else if (textLines.length == doc.sel.ranges.length)
-        multiPaste = map(textLines, function(l) { return [l]; });
-    }
-
-    // Normal behavior is to insert the new text into every selection
-    for (var i = doc.sel.ranges.length - 1; i >= 0; i--) {
-      var range = doc.sel.ranges[i];
-      var from = range.from(), to = range.to();
-      // Handle deletion
-      if (same < prevInput.length)
-        from = Pos(from.line, from.ch - (prevInput.length - same));
-      // Handle overwrite
-      else if (cm.state.overwrite && range.empty() && !cm.state.pasteIncoming)
-        to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
-      var updateInput = cm.curOp.updateInput;
-      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
-                         origin: cm.state.pasteIncoming ? "paste" : cm.state.cutIncoming ? "cut" : "+input"};
-      makeChange(cm.doc, changeEvent);
-      signalLater(cm, "inputRead", cm, changeEvent);
-      // When an 'electric' character is inserted, immediately trigger a reindent
-      if (inserted && !cm.state.pasteIncoming && cm.options.electricChars &&
-          cm.options.smartIndent && range.head.ch < 100 &&
-          (!i || doc.sel.ranges[i - 1].head.line != range.head.line)) {
-        var mode = cm.getModeAt(range.head);
-        var end = changeEnd(changeEvent);
-        if (mode.electricChars) {
-          for (var j = 0; j < mode.electricChars.length; j++)
-            if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
-              indentLine(cm, end.line, "smart");
-              break;
-            }
-        } else if (mode.electricInput) {
-          if (mode.electricInput.test(getLine(doc, end.line).text.slice(0, end.ch)))
-            indentLine(cm, end.line, "smart");
-        }
-      }
-    }
-    ensureCursorVisible(cm);
-    cm.curOp.updateInput = updateInput;
-    cm.curOp.typing = true;
-
-    // Don't leave long text in the textarea, since it makes further polling slow
-    if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";
-    else cm.display.prevInput = text;
-    if (withOp) endOperation(cm);
-    cm.state.pasteIncoming = cm.state.cutIncoming = false;
-    return true;
-  }
-
-  // Reset the input to correspond to the selection (or to be empty,
-  // when not typing and nothing is selected)
-  function resetInput(cm, typing) {
-    if (cm.display.contextMenuPending) return;
-    var minimal, selected, doc = cm.doc;
-    if (cm.somethingSelected()) {
-      cm.display.prevInput = "";
-      var range = doc.sel.primary();
-      minimal = hasCopyEvent &&
-        (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
-      var content = minimal ? "-" : selected || cm.getSelection();
-      cm.display.input.value = content;
-      if (cm.state.focused) selectInput(cm.display.input);
-      if (ie && ie_version >= 9) cm.display.inputHasSelection = content;
-    } else if (!typing) {
-      cm.display.prevInput = cm.display.input.value = "";
-      if (ie && ie_version >= 9) cm.display.inputHasSelection = null;
-    }
-    cm.display.inaccurateSelection = minimal;
-  }
-
-  function focusInput(cm) {
-    if (cm.options.readOnly != "nocursor" && (!mobile || activeElt() != cm.display.input))
-      cm.display.input.focus();
-  }
-
-  function ensureFocus(cm) {
-    if (!cm.state.focused) { focusInput(cm); onFocus(cm); }
-  }
-
-  function isReadOnly(cm) {
-    return cm.options.readOnly || cm.doc.cantEdit;
-  }
-
   // EVENT HANDLERS
 
   // Attach the necessary event handlers when initializing the editor
   function registerEventHandlers(cm) {
     var d = cm.display;
     on(d.scroller, "mousedown", operation(cm, onMouseDown));
     // Older IE's will not fire a second mousedown for a double click
     if (ie && ie_version < 11)
       on(d.scroller, "dblclick", operation(cm, function(e) {
         if (signalDOMEvent(cm, e)) return;
         var pos = posFromMouse(cm, e);
         if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
         e_preventDefault(e);
         var word = cm.findWordAt(pos);
         extendSelection(cm.doc, word.anchor, word.head);
       }));
     else
       on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
-    // Prevent normal selection in the editor (we handle our own)
-    on(d.lineSpace, "selectstart", function(e) {
-      if (!eventInWidget(d, e)) e_preventDefault(e);
-    });
     // Some browsers fire contextmenu *after* opening the menu, at
     // which point we can't mess with it anymore. Context menu is
     // handled in onMouseDown for these browsers.
     if (!captureRightClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
 
+    // Used to suppress mouse event handling when a touch happens
+    var touchFinished, prevTouch = {end: 0};
+    function finishTouch() {
+      if (d.activeTouch) {
+        touchFinished = setTimeout(function() {d.activeTouch = null;}, 1000);
+        prevTouch = d.activeTouch;
+        prevTouch.end = +new Date;
+      }
+    };
+    function isMouseLikeTouchEvent(e) {
+      if (e.touches.length != 1) return false;
+      var touch = e.touches[0];
+      return touch.radiusX <= 1 && touch.radiusY <= 1;
+    }
+    function farAway(touch, other) {
+      if (other.left == null) return true;
+      var dx = other.left - touch.left, dy = other.top - touch.top;
+      return dx * dx + dy * dy > 20 * 20;
+    }
+    on(d.scroller, "touchstart", function(e) {
+      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e)) {
+        clearTimeout(touchFinished);
+        var now = +new Date;
+        d.activeTouch = {start: now, moved: false,
+                         prev: now - prevTouch.end <= 300 ? prevTouch : null};
+        if (e.touches.length == 1) {
+          d.activeTouch.left = e.touches[0].pageX;
+          d.activeTouch.top = e.touches[0].pageY;
+        }
+      }
+    });
+    on(d.scroller, "touchmove", function() {
+      if (d.activeTouch) d.activeTouch.moved = true;
+    });
+    on(d.scroller, "touchend", function(e) {
+      var touch = d.activeTouch;
+      if (touch && !eventInWidget(d, e) && touch.left != null &&
+          !touch.moved && new Date - touch.start < 300) {
+        var pos = cm.coordsChar(d.activeTouch, "page"), range;
+        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
+          range = new Range(pos, pos);
+        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
+          range = cm.findWordAt(pos);
+        else // Triple tap
+          range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
+        cm.setSelection(range.anchor, range.head);
+        cm.focus();
+        e_preventDefault(e);
+      }
+      finishTouch();
+    });
+    on(d.scroller, "touchcancel", finishTouch);
+
     // Sync scrolling between fake scrollbars and real scrollable
     // area, ensure viewport is updated when scrolling.
     on(d.scroller, "scroll", function() {
       if (d.scroller.clientHeight) {
         setScrollTop(cm, d.scroller.scrollTop);
         setScrollLeft(cm, d.scroller.scrollLeft, true);
         signal(cm, "scroll", cm);
       }
     });
 
     // Listen to wheel events in order to try and update the viewport on time.
     on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
     on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
 
     // Prevent wrapper from ever scrolling
     on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
 
-    on(d.input, "keyup", function(e) { onKeyUp.call(cm, e); });
-    on(d.input, "input", function() {
-      if (ie && ie_version >= 9 && cm.display.inputHasSelection) cm.display.inputHasSelection = null;
-      readInput(cm);
-    });
-    on(d.input, "keydown", operation(cm, onKeyDown));
-    on(d.input, "keypress", operation(cm, onKeyPress));
-    on(d.input, "focus", bind(onFocus, cm));
-    on(d.input, "blur", bind(onBlur, cm));
+    d.dragFunctions = {
+      enter: function(e) {if (!signalDOMEvent(cm, e)) e_stop(e);},
+      over: function(e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
+      start: function(e){onDragStart(cm, e);},
+      drop: operation(cm, onDrop),
+      leave: function(e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
+    };
 
-    function drag_(e) {
-      if (!signalDOMEvent(cm, e)) e_stop(e);
+    var inp = d.input.getField();
+    on(inp, "keyup", function(e) { onKeyUp.call(cm, e); });
+    on(inp, "keydown", operation(cm, onKeyDown));
+    on(inp, "keypress", operation(cm, onKeyPress));
+    on(inp, "focus", bind(onFocus, cm));
+    on(inp, "blur", bind(onBlur, cm));
+  }
+
+  function dragDropChanged(cm, value, old) {
+    var wasOn = old && old != CodeMirror.Init;
+    if (!value != !wasOn) {
+      var funcs = cm.display.dragFunctions;
+      var toggle = value ? on : off;
+      toggle(cm.display.scroller, "dragstart", funcs.start);
+      toggle(cm.display.scroller, "dragenter", funcs.enter);
+      toggle(cm.display.scroller, "dragover", funcs.over);
+      toggle(cm.display.scroller, "dragleave", funcs.leave);
+      toggle(cm.display.scroller, "drop", funcs.drop);
     }
-    if (cm.options.dragDrop) {
-      on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});
-      on(d.scroller, "dragenter", drag_);
-      on(d.scroller, "dragover", drag_);
-      on(d.scroller, "drop", operation(cm, onDrop));
-    }
-    on(d.scroller, "paste", function(e) {
-      if (eventInWidget(d, e)) return;
-      cm.state.pasteIncoming = true;
-      focusInput(cm);
-      fastPoll(cm);
-    });
-    on(d.input, "paste", function() {
-      // Workaround for webkit bug https://bugs.webkit.org/show_bug.cgi?id=90206
-      // Add a char to the end of textarea before paste occur so that
-      // selection doesn't span to the end of textarea.
-      if (webkit && !cm.state.fakedLastChar && !(new Date - cm.state.lastMiddleDown < 200)) {
-        var start = d.input.selectionStart, end = d.input.selectionEnd;
-        d.input.value += "$";
-        // The selection end needs to be set before the start, otherwise there
-        // can be an intermediate non-empty selection between the two, which
-        // can override the middle-click paste buffer on linux and cause the
-        // wrong thing to get pasted.
-        d.input.selectionEnd = end;
-        d.input.selectionStart = start;
-        cm.state.fakedLastChar = true;
-      }
-      cm.state.pasteIncoming = true;
-      fastPoll(cm);
-    });
-
-    function prepareCopyCut(e) {
-      if (cm.somethingSelected()) {
-        lastCopied = cm.getSelections();
-        if (d.inaccurateSelection) {
-          d.prevInput = "";
-          d.inaccurateSelection = false;
-          d.input.value = lastCopied.join("\n");
-          selectInput(d.input);
-        }
-      } else {
-        var text = [], ranges = [];
-        for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
-          var line = cm.doc.sel.ranges[i].head.line;
-          var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
-          ranges.push(lineRange);
-          text.push(cm.getRange(lineRange.anchor, lineRange.head));
-        }
-        if (e.type == "cut") {
-          cm.setSelections(ranges, null, sel_dontScroll);
-        } else {
-          d.prevInput = "";
-          d.input.value = text.join("\n");
-          selectInput(d.input);
-        }
-        lastCopied = text;
-      }
-      if (e.type == "cut") cm.state.cutIncoming = true;
-    }
-    on(d.input, "cut", prepareCopyCut);
-    on(d.input, "copy", prepareCopyCut);
-
-    // Needed to handle Tab key in KHTML
-    if (khtml) on(d.sizer, "mouseup", function() {
-      if (activeElt() == d.input) d.input.blur();
-      focusInput(cm);
-    });
   }
 
   // Called when the window resizes
   function onResize(cm) {
     var d = cm.display;
     if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
       return;
     // Might be a text scaling operation, clear size caches.
     d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
     d.scrollbarsClipped = false;
@@ skipping 11 matching lines @@
     }
   }
 
   // Given a mouse event, find the corresponding position. If liberal
   // is false, it checks whether a gutter or scrollbar was clicked,
   // and returns null if it was. forRect is used by rectangular
   // selections, and tries to estimate a character position even for
   // coordinates beyond the right of the text.
   function posFromMouse(cm, e, liberal, forRect) {
     var display = cm.display;
-    if (!liberal && e_target(e).getAttribute("not-content") == "true") return null;
+    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null;
 
     var x, y, space = display.lineSpace.getBoundingClientRect();
     // Fails unpredictably on IE[67] when mouse is dragged around quickly.
     try { x = e.clientX - space.left; y = e.clientY - space.top; }
     catch (e) { return null; }
     var coords = coordsChar(cm, x, y), line;
     if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
       var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
       coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
     }
     return coords;
   }
 
   // A mouse down can be a single click, double click, triple click,
   // start of selection drag, start of text drag, new cursor
   // (ctrl-click), rectangle drag (alt-drag), or xwin
   // middle-click-paste. Or it might be a click on something we should
   // not interfere with, such as a scrollbar or widget.
   function onMouseDown(e) {
-    if (signalDOMEvent(this, e)) return;
     var cm = this, display = cm.display;
+    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) return;
     display.shift = e.shiftKey;
 
     if (eventInWidget(display, e)) {
       if (!webkit) {
         // Briefly turn off draggability, to allow widgets to do
         // normal dragging things.
         display.scroller.draggable = false;
         setTimeout(function(){display.scroller.draggable = true;}, 100);
       }
       return;
     }
     if (clickInGutter(cm, e)) return;
     var start = posFromMouse(cm, e);
     window.focus();
 
     switch (e_button(e)) {
     case 1:
-      if (start)
+      // #3261: make sure, that we're not starting a second selection
+      if (cm.state.selectingText)
+        cm.state.selectingText(e);
+      else if (start)
         leftButtonDown(cm, e, start);
       else if (e_target(e) == display.scroller)
         e_preventDefault(e);
       break;
     case 2:
       if (webkit) cm.state.lastMiddleDown = +new Date;
       if (start) extendSelection(cm.doc, start);
-      setTimeout(bind(focusInput, cm), 20);
+      setTimeout(function() {display.input.focus();}, 20);
       e_preventDefault(e);
       break;
     case 3:
       if (captureRightClick) onContextMenu(cm, e);
+      else delayBlurEvent(cm);
       break;
     }
   }
 
   var lastClick, lastDoubleClick;
   function leftButtonDown(cm, e, start) {
-    setTimeout(bind(ensureFocus, cm), 0);
+    if (ie) setTimeout(bind(ensureFocus, cm), 0);
+    else cm.curOp.focus = activeElt();
 
     var now = +new Date, type;
     if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
       type = "triple";
     } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
       type = "double";
       lastDoubleClick = {time: now, pos: start};
     } else {
       type = "single";
       lastClick = {time: now, pos: start};
     }
 
     var sel = cm.doc.sel, modifier = mac ? e.metaKey : e.ctrlKey, contained;
-    if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) &&
+    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
         type == "single" && (contained = sel.contains(start)) > -1 &&
-        !sel.ranges[contained].empty())
+        (cmp((contained = sel.ranges[contained]).from(), start) < 0 || start.xRel > 0) &&
+        (cmp(contained.to(), start) > 0 || start.xRel < 0))
       leftButtonStartDrag(cm, e, start, modifier);
     else
       leftButtonSelect(cm, e, start, type, modifier);
   }
 
   // Start a text drag. When it ends, see if any dragging actually
   // happen, and treat as a click if it didn't.
   function leftButtonStartDrag(cm, e, start, modifier) {
-    var display = cm.display;
+    var display = cm.display, startTime = +new Date;
     var dragEnd = operation(cm, function(e2) {
       if (webkit) display.scroller.draggable = false;
       cm.state.draggingText = false;
       off(document, "mouseup", dragEnd);
       off(display.scroller, "drop", dragEnd);
       if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
         e_preventDefault(e2);
-        if (!modifier)
+        if (!modifier && +new Date - 200 < startTime)
           extendSelection(cm.doc, start);
-        focusInput(cm);
-        // Work around unexplainable focus problem in IE9 (#2127)
-        if (ie && ie_version == 9)
-          setTimeout(function() {document.body.focus(); focusInput(cm);}, 20);
+        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
+        if (webkit || ie && ie_version == 9)
+          setTimeout(function() {document.body.focus(); display.input.focus();}, 20);
+        else
+          display.input.focus();
       }
     });
     // Let the drag handler handle this.
     if (webkit) display.scroller.draggable = true;
     cm.state.draggingText = dragEnd;
+    dragEnd.copy = mac ? e.altKey : e.ctrlKey
     // IE's approach to draggable
     if (display.scroller.dragDrop) display.scroller.dragDrop();
     on(document, "mouseup", dragEnd);
     on(display.scroller, "drop", dragEnd);
   }
 
   // Normal selection, as opposed to text dragging.
   function leftButtonSelect(cm, e, start, type, addNew) {
     var display = cm.display, doc = cm.doc;
     e_preventDefault(e);
 
     var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
     if (addNew && !e.shiftKey) {
       ourIndex = doc.sel.contains(start);
       if (ourIndex > -1)
         ourRange = ranges[ourIndex];
       else
         ourRange = new Range(start, start);
     } else {
       ourRange = doc.sel.primary();
+      ourIndex = doc.sel.primIndex;
     }
 
-    if (e.altKey) {
+    if (chromeOS ? e.shiftKey && e.metaKey : e.altKey) {
       type = "rect";
       if (!addNew) ourRange = new Range(start, start);
       start = posFromMouse(cm, e, true, true);
       ourIndex = -1;
     } else if (type == "double") {
       var word = cm.findWordAt(start);
       if (cm.display.shift || doc.extend)
         ourRange = extendRange(doc, ourRange, word.anchor, word.head);
       else
         ourRange = word;
     } else if (type == "triple") {
       var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
       if (cm.display.shift || doc.extend)
         ourRange = extendRange(doc, ourRange, line.anchor, line.head);
       else
         ourRange = line;
     } else {
       ourRange = extendRange(doc, ourRange, start);
     }
 
     if (!addNew) {
       ourIndex = 0;
       setSelection(doc, new Selection([ourRange], 0), sel_mouse);
       startSel = doc.sel;
     } else if (ourIndex == -1) {
       ourIndex = ranges.length;
       setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
                    {scroll: false, origin: "*mouse"});
-    } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single") {
-      setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0));
+    } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single" && !e.shiftKey) {
+      setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
+                   {scroll: false, origin: "*mouse"});
       startSel = doc.sel;
     } else {
       replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
     }
 
     var lastPos = start;
     function extendTo(pos) {
       if (cmp(lastPos, pos) == 0) return;
       lastPos = pos;
 
@@ skipping 41 matching lines @@
     // happened in the meantime (clearTimeout isn't reliable -- at
     // least on Chrome, the timeouts still happen even when cleared,
     // if the clear happens after their scheduled firing time).
     var counter = 0;
 
     function extend(e) {
       var curCount = ++counter;
       var cur = posFromMouse(cm, e, true, type == "rect");
       if (!cur) return;
       if (cmp(cur, lastPos) != 0) {
-        ensureFocus(cm);
+        cm.curOp.focus = activeElt();
         extendTo(cur);
         var visible = visibleLines(display, doc);
         if (cur.line >= visible.to || cur.line < visible.from)
           setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
       } else {
         var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
         if (outside) setTimeout(operation(cm, function() {
           if (counter != curCount) return;
           display.scroller.scrollTop += outside;
           extend(e);
         }), 50);
       }
     }
 
     function done(e) {
+      cm.state.selectingText = false;
       counter = Infinity;
       e_preventDefault(e);
-      focusInput(cm);
+      display.input.focus();
       off(document, "mousemove", move);
       off(document, "mouseup", up);
       doc.history.lastSelOrigin = null;
     }
 
     var move = operation(cm, function(e) {
       if (!e_button(e)) done(e);
       else extend(e);
     });
     var up = operation(cm, done);
+    cm.state.selectingText = up;
     on(document, "mousemove", move);
     on(document, "mouseup", up);
   }
 
   // Determines whether an event happened in the gutter, and fires the
   // handlers for the corresponding event.
-  function gutterEvent(cm, e, type, prevent, signalfn) {
+  function gutterEvent(cm, e, type, prevent) {
     try { var mX = e.clientX, mY = e.clientY; }
     catch(e) { return false; }
     if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) return false;
     if (prevent) e_preventDefault(e);
 
     var display = cm.display;
     var lineBox = display.lineDiv.getBoundingClientRect();
 
     if (mY > lineBox.bottom || !hasHandler(cm, type)) return e_defaultPrevented(e);
     mY -= lineBox.top - display.viewOffset;
 
     for (var i = 0; i < cm.options.gutters.length; ++i) {
       var g = display.gutters.childNodes[i];
       if (g && g.getBoundingClientRect().right >= mX) {
         var line = lineAtHeight(cm.doc, mY);
         var gutter = cm.options.gutters[i];
-        signalfn(cm, type, cm, line, gutter, e);
+        signal(cm, type, cm, line, gutter, e);
         return e_defaultPrevented(e);
       }
     }
   }
 
   function clickInGutter(cm, e) {
-    return gutterEvent(cm, e, "gutterClick", true, signalLater);
+    return gutterEvent(cm, e, "gutterClick", true);
   }
 
   // Kludge to work around strange IE behavior where it'll sometimes
   // re-fire a series of drag-related events right after the drop (#1551)
   var lastDrop = 0;
 
   function onDrop(e) {
     var cm = this;
+    clearDragCursor(cm);
     if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
       return;
     e_preventDefault(e);
     if (ie) lastDrop = +new Date;
     var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
-    if (!pos || isReadOnly(cm)) return;
+    if (!pos || cm.isReadOnly()) return;
     // Might be a file drop, in which case we simply extract the text
     // and insert it.
     if (files && files.length && window.FileReader && window.File) {
       var n = files.length, text = Array(n), read = 0;
       var loadFile = function(file, i) {
+        if (cm.options.allowDropFileTypes &&
+            indexOf(cm.options.allowDropFileTypes, file.type) == -1)
+          return;
+
         var reader = new FileReader;
         reader.onload = operation(cm, function() {
-          text[i] = reader.result;
+          var content = reader.result;
+          if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) content = "";
+          text[i] = content;
           if (++read == n) {
             pos = clipPos(cm.doc, pos);
-            var change = {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"};
+            var change = {from: pos, to: pos,
+                          text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
+                          origin: "paste"};
             makeChange(cm.doc, change);
             setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
           }
         });
         reader.readAsText(file);
       };
       for (var i = 0; i < n; ++i) loadFile(files[i], i);
     } else { // Normal drop
       // Don't do a replace if the drop happened inside of the selected text.
       if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
         cm.state.draggingText(e);
         // Ensure the editor is re-focused
-        setTimeout(bind(focusInput, cm), 20);
+        setTimeout(function() {cm.display.input.focus();}, 20);
         return;
       }
       try {
         var text = e.dataTransfer.getData("Text");
         if (text) {
-          if (cm.state.draggingText && !(mac ? e.metaKey : e.ctrlKey))
+          if (cm.state.draggingText && !cm.state.draggingText.copy)
             var selected = cm.listSelections();
           setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
           if (selected) for (var i = 0; i < selected.length; ++i)
             replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
           cm.replaceSelection(text, "around", "paste");
-          focusInput(cm);
+          cm.display.input.focus();
         }
       }
       catch(e){}
     }
   }
 
   function onDragStart(cm, e) {
     if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
     if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
 
     e.dataTransfer.setData("Text", cm.getSelection());
+    e.dataTransfer.effectAllowed = "copyMove"
 
     // Use dummy image instead of default browsers image.
     // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
     if (e.dataTransfer.setDragImage && !safari) {
       var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
       img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
       if (presto) {
         img.width = img.height = 1;
         cm.display.wrapper.appendChild(img);
         // Force a relayout, or Opera won't use our image for some obscure reason
         img._top = img.offsetTop;
       }
       e.dataTransfer.setDragImage(img, 0, 0);
       if (presto) img.parentNode.removeChild(img);
     }
   }
 
+  function onDragOver(cm, e) {
+    var pos = posFromMouse(cm, e);
+    if (!pos) return;
+    var frag = document.createDocumentFragment();
+    drawSelectionCursor(cm, pos, frag);
+    if (!cm.display.dragCursor) {
+      cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
+      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
+    }
+    removeChildrenAndAdd(cm.display.dragCursor, frag);
+  }
+
+  function clearDragCursor(cm) {
+    if (cm.display.dragCursor) {
+      cm.display.lineSpace.removeChild(cm.display.dragCursor);
+      cm.display.dragCursor = null;
+    }
+  }
+
   // SCROLL EVENTS
 
   // Sync the scrollable area and scrollbars, ensure the viewport
   // covers the visible area.
   function setScrollTop(cm, val) {
     if (Math.abs(cm.doc.scrollTop - val) < 2) return;
     cm.doc.scrollTop = val;
     if (!gecko) updateDisplaySimple(cm, {top: val});
     if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
     cm.display.scrollbars.setScrollTop(val);
@@ skipping 44 matching lines @@
     delta.x *= wheelPixelsPerUnit;
     delta.y *= wheelPixelsPerUnit;
     return delta;
   };
 
   function onScrollWheel(cm, e) {
     var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
 
     var display = cm.display, scroll = display.scroller;
     // Quit if there's nothing to scroll here
-    if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
-          dy && scroll.scrollHeight > scroll.clientHeight)) return;
+    var canScrollX = scroll.scrollWidth > scroll.clientWidth;
+    var canScrollY = scroll.scrollHeight > scroll.clientHeight;
+    if (!(dx && canScrollX || dy && canScrollY)) return;
 
     // Webkit browsers on OS X abort momentum scrolls when the target
     // of the scroll event is removed from the scrollable element.
     // This hack (see related code in patchDisplay) makes sure the
     // element is kept around.
     if (dy && mac && webkit) {
       outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
         for (var i = 0; i < view.length; i++) {
           if (view[i].node == cur) {
             cm.display.currentWheelTarget = cur;
             break outer;
           }
         }
       }
     }
 
     // On some browsers, horizontal scrolling will cause redraws to
     // happen before the gutter has been realigned, causing it to
     // wriggle around in a most unseemly way. When we have an
     // estimated pixels/delta value, we just handle horizontal
     // scrolling entirely here. It'll be slightly off from native, but
     // better than glitching out.
     if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
-      if (dy)
+      if (dy && canScrollY)
         setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
       setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
-      e_preventDefault(e);
+      // Only prevent default scrolling if vertical scrolling is
+      // actually possible. Otherwise, it causes vertical scroll
+      // jitter on OSX trackpads when deltaX is small and deltaY
+      // is large (issue #3579)
+      if (!dy || (dy && canScrollY))
+        e_preventDefault(e);
       display.wheelStartX = null; // Abort measurement, if in progress
       return;
     }
 
     // 'Project' the visible viewport to cover the area that is being
     // scrolled into view (if we know enough to estimate it).
     if (dy && wheelPixelsPerUnit != null) {
       var pixels = dy * wheelPixelsPerUnit;
       var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
       if (pixels < 0) top = Math.max(0, top + pixels - 50);
@@ skipping 25 matching lines @@
   // KEY EVENTS
 
   // Run a handler that was bound to a key.
   function doHandleBinding(cm, bound, dropShift) {
     if (typeof bound == "string") {
       bound = commands[bound];
       if (!bound) return false;
     }
     // Ensure previous input has been read, so that the handler sees a
     // consistent view of the document
-    if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;
+    cm.display.input.ensurePolled();
     var prevShift = cm.display.shift, done = false;
     try {
-      if (isReadOnly(cm)) cm.state.suppressEdits = true;
+      if (cm.isReadOnly()) cm.state.suppressEdits = true;
       if (dropShift) cm.display.shift = false;
       done = bound(cm) != Pass;
     } finally {
       cm.display.shift = prevShift;
       cm.state.suppressEdits = false;
     }
     return done;
   }
 
   function lookupKeyForEditor(cm, name, handle) {
     for (var i = 0; i < cm.state.keyMaps.length; i++) {
       var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
       if (result) return result;
     }
     return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
       || lookupKey(name, cm.options.keyMap, handle, cm);
   }
 
   var stopSeq = new Delayed;
   function dispatchKey(cm, name, e, handle) {
     var seq = cm.state.keySeq;
     if (seq) {
       if (isModifierKey(name)) return "handled";
       stopSeq.set(50, function() {
         if (cm.state.keySeq == seq) {
           cm.state.keySeq = null;
-          resetInput(cm);
+          cm.display.input.reset();
         }
       });
       name = seq + " " + name;
     }
     var result = lookupKeyForEditor(cm, name, handle);
 
     if (result == "multi")
       cm.state.keySeq = name;
     if (result == "handled")
       signalLater(cm, "keyHandled", cm, name, e);
@@ skipping 31 matching lines @@
 
   // Handle a key from the keypress event
   function handleCharBinding(cm, e, ch) {
     return dispatchKey(cm, "'" + ch + "'", e,
                        function(b) { return doHandleBinding(cm, b, true); });
   }
 
   var lastStoppedKey = null;
   function onKeyDown(e) {
     var cm = this;
-    ensureFocus(cm);
+    cm.curOp.focus = activeElt();
     if (signalDOMEvent(cm, e)) return;
     // IE does strange things with escape.
     if (ie && ie_version < 11 && e.keyCode == 27) e.returnValue = false;
     var code = e.keyCode;
     cm.display.shift = code == 16 || e.shiftKey;
     var handled = handleKeyBinding(cm, e);
     if (presto) {
       lastStoppedKey = handled ? code : null;
       // Opera has no cut event... we try to at least catch the key combo
       if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
@@ skipping 20 matching lines @@
     on(document, "mouseover", up);
   }
 
   function onKeyUp(e) {
     if (e.keyCode == 16) this.doc.sel.shift = false;
     signalDOMEvent(this, e);
   }
 
   function onKeyPress(e) {
     var cm = this;
-    if (signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) return;
+    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) return;
     var keyCode = e.keyCode, charCode = e.charCode;
     if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
-    if (((presto && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;
+    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) return;
     var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
     if (handleCharBinding(cm, e, ch)) return;
-    if (ie && ie_version >= 9) cm.display.inputHasSelection = null;
-    fastPoll(cm);
+    cm.display.input.onKeyPress(e);
   }
 
   // FOCUS/BLUR EVENTS
 
+  function delayBlurEvent(cm) {
+    cm.state.delayingBlurEvent = true;
+    setTimeout(function() {
+      if (cm.state.delayingBlurEvent) {
+        cm.state.delayingBlurEvent = false;
+        onBlur(cm);
+      }
+    }, 100);
+  }
+
   function onFocus(cm) {
+    if (cm.state.delayingBlurEvent) cm.state.delayingBlurEvent = false;
+
     if (cm.options.readOnly == "nocursor") return;
     if (!cm.state.focused) {
       signal(cm, "focus", cm);
       cm.state.focused = true;
       addClass(cm.display.wrapper, "CodeMirror-focused");
-      // The prevInput test prevents this from firing when a context
-      // menu is closed (since the resetInput would kill the
+      // This test prevents this from firing when a context
+      // menu is closed (since the input reset would kill the
       // select-all detection hack)
       if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
-        resetInput(cm);
-        if (webkit) setTimeout(bind(resetInput, cm, true), 0); // Issue #1730
+        cm.display.input.reset();
+        if (webkit) setTimeout(function() { cm.display.input.reset(true); }, 20); // Issue #1730
       }
+      cm.display.input.receivedFocus();
     }
-    slowPoll(cm);
     restartBlink(cm);
   }
   function onBlur(cm) {
+    if (cm.state.delayingBlurEvent) return;
+
     if (cm.state.focused) {
       signal(cm, "blur", cm);
       cm.state.focused = false;
       rmClass(cm.display.wrapper, "CodeMirror-focused");
     }
     clearInterval(cm.display.blinker);
     setTimeout(function() {if (!cm.state.focused) cm.display.shift = false;}, 150);
   }
 
   // CONTEXT MENU HANDLING
 
   // To make the context menu work, we need to briefly unhide the
   // textarea (making it as unobtrusive as possible) to let the
   // right-click take effect on it.
   function onContextMenu(cm, e) {
+    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) return;
     if (signalDOMEvent(cm, e, "contextmenu")) return;
-    var display = cm.display;
-    if (eventInWidget(display, e) || contextMenuInGutter(cm, e)) return;
-
-    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
-    if (!pos || presto) return; // Opera is difficult.
-
-    // Reset the current text selection only if the click is done outside of the selection
-    // and 'resetSelectionOnContextMenu' option is true.
-    var reset = cm.options.resetSelectionOnContextMenu;
-    if (reset && cm.doc.sel.contains(pos) == -1)
-      operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
-
-    var oldCSS = display.input.style.cssText;
-    display.inputDiv.style.position = "absolute";
-    display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
-      "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: " +
-      (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
-      "; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
-    if (webkit) var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
-    focusInput(cm);
-    if (webkit) window.scrollTo(null, oldScrollY);
-    resetInput(cm);
-    // Adds "Select all" to context menu in FF
-    if (!cm.somethingSelected()) display.input.value = display.prevInput = " ";
-    display.contextMenuPending = true;
-    display.selForContextMenu = cm.doc.sel;
-    clearTimeout(display.detectingSelectAll);
-
-    // Select-all will be greyed out if there's nothing to select, so
-    // this adds a zero-width space so that we can later check whether
-    // it got selected.
-    function prepareSelectAllHack() {
-      if (display.input.selectionStart != null) {
-        var selected = cm.somethingSelected();
-        var extval = display.input.value = "\u200b" + (selected ? display.input.value : "");
-        display.prevInput = selected ? "" : "\u200b";
-        display.input.selectionStart = 1; display.input.selectionEnd = extval.length;
-        // Re-set this, in case some other handler touched the
-        // selection in the meantime.
-        display.selForContextMenu = cm.doc.sel;
-      }
-    }
-    function rehide() {
-      display.contextMenuPending = false;
-      display.inputDiv.style.position = "relative";
-      display.input.style.cssText = oldCSS;
-      if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
-      slowPoll(cm);
-
-      // Try to detect the user choosing select-all
-      if (display.input.selectionStart != null) {
-        if (!ie || (ie && ie_version < 9)) prepareSelectAllHack();
-        var i = 0, poll = function() {
-          if (display.selForContextMenu == cm.doc.sel && display.input.selectionStart == 0)
-            operation(cm, commands.selectAll)(cm);
-          else if (i++ < 10) display.detectingSelectAll = setTimeout(poll, 500);
-          else resetInput(cm);
-        };
-        display.detectingSelectAll = setTimeout(poll, 200);
-      }
-    }
-
-    if (ie && ie_version >= 9) prepareSelectAllHack();
-    if (captureRightClick) {
-      e_stop(e);
-      var mouseup = function() {
-        off(window, "mouseup", mouseup);
-        setTimeout(rehide, 20);
-      };
-      on(window, "mouseup", mouseup);
-    } else {
-      setTimeout(rehide, 50);
-    }
+    cm.display.input.onContextMenu(e);
   }
 
   function contextMenuInGutter(cm, e) {
     if (!hasHandler(cm, "gutterContextMenu")) return false;
-    return gutterEvent(cm, e, "gutterContextMenu", false, signal);
+    return gutterEvent(cm, e, "gutterContextMenu", false);
   }
 
   // UPDATING
 
   // Compute the position of the end of a change (its 'to' property
   // refers to the pre-change end).
   var changeEnd = CodeMirror.changeEnd = function(change) {
     if (!change.text) return change.to;
     return Pos(change.from.line + change.text.length - 1,
                lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
@@ skipping 107 matching lines @@
       if (!sharedHist && indexOf(rebased, doc.history) == -1) {
         rebaseHist(doc.history, change);
         rebased.push(doc.history);
       }
       makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
     });
   }
 
   // Revert a change stored in a document's history.
   function makeChangeFromHistory(doc, type, allowSelectionOnly) {
-    if (doc.cm && doc.cm.state.suppressEdits) return;
+    if (doc.cm && doc.cm.state.suppressEdits && !allowSelectionOnly) return;
 
     var hist = doc.history, event, selAfter = doc.sel;
     var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
 
     // Verify that there is a useable event (so that ctrl-z won't
     // needlessly clear selection events)
     for (var i = 0; i < source.length; i++) {
       event = source[i];
       if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
         break;
@@ skipping 155 matching lines @@
       };
       if (changeHandler) signalLater(cm, "change", cm, obj);
       if (changesHandler) (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
     }
     cm.display.selForContextMenu = null;
   }
 
   function replaceRange(doc, code, from, to, origin) {
     if (!to) to = from;
     if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
-    if (typeof code == "string") code = splitLines(code);
+    if (typeof code == "string") code = doc.splitLines(code);
     makeChange(doc, {from: from, to: to, text: code, origin: origin});
   }
 
   // SCROLLING THINGS INTO VIEW
 
   // If an editor sits on the top or bottom of the window, partially
   // scrolled out of view, this ensures that the cursor is visible.
   function maybeScrollWindow(cm, coords) {
     if (signalDOMEvent(cm, "scrollCursorIntoView")) return;
 
@@ skipping 158 matching lines @@
     }
     indentation = Math.max(0, indentation);
 
     var indentString = "", pos = 0;
     if (cm.options.indentWithTabs)
       for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
     if (pos < indentation) indentString += spaceStr(indentation - pos);
 
     if (indentString != curSpaceString) {
       replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
+      line.stateAfter = null;
+      return true;
     } else {
       // Ensure that, if the cursor was in the whitespace at the start
       // of the line, it is moved to the end of that space.
       for (var i = 0; i < doc.sel.ranges.length; i++) {
         var range = doc.sel.ranges[i];
         if (range.head.line == n && range.head.ch < curSpaceString.length) {
           var pos = Pos(n, curSpaceString.length);
           replaceOneSelection(doc, i, new Range(pos, pos));
           break;
         }
       }
     }
-    line.stateAfter = null;
   }
 
   // Utility for applying a change to a line by handle or number,
   // returning the number and optionally registering the line as
   // changed.
   function changeLine(doc, handle, changeType, op) {
     var no = handle, line = handle;
     if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
     else no = lineNo(handle);
     if (no == null) return null;
@@ skipping 31 matching lines @@
   // cross line boundaries), "word" (across next word), or "group" (to
   // the start of next group of word or non-word-non-whitespace
   // chars). The visually param controls whether, in right-to-left
   // text, direction 1 means to move towards the next index in the
   // string, or towards the character to the right of the current
   // position. The resulting position will have a hitSide=true
   // property if it reached the end of the document.
   function findPosH(doc, pos, dir, unit, visually) {
     var line = pos.line, ch = pos.ch, origDir = dir;
     var lineObj = getLine(doc, line);
-    var possible = true;
     function findNextLine() {
       var l = line + dir;
-      if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
+      if (l < doc.first || l >= doc.first + doc.size) return false
       line = l;
       return lineObj = getLine(doc, l);
     }
     function moveOnce(boundToLine) {
       var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
       if (next == null) {
         if (!boundToLine && findNextLine()) {
           if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
           else ch = dir < 0 ? lineObj.text.length : 0;
-        } else return (possible = false);
+        } else return false
       } else ch = next;
       return true;
     }
 
-    if (unit == "char") moveOnce();
-    else if (unit == "column") moveOnce(true);
-    else if (unit == "word" || unit == "group") {
+    if (unit == "char") {
+      moveOnce()
+    } else if (unit == "column") {
+      moveOnce(true)
+    } else if (unit == "word" || unit == "group") {
       var sawType = null, group = unit == "group";
       var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
       for (var first = true;; first = false) {
         if (dir < 0 && !moveOnce(!first)) break;
         var cur = lineObj.text.charAt(ch) || "\n";
         var type = isWordChar(cur, helper) ? "w"
           : group && cur == "\n" ? "n"
           : !group || /\s/.test(cur) ? null
           : "p";
         if (group && !first && !type) type = "s";
         if (sawType && sawType != type) {
           if (dir < 0) {dir = 1; moveOnce();}
           break;
         }
 
         if (type) sawType = type;
         if (dir > 0 && !moveOnce(!first)) break;
       }
     }
-    var result = skipAtomic(doc, Pos(line, ch), origDir, true);
-    if (!possible) result.hitSide = true;
+    var result = skipAtomic(doc, Pos(line, ch), pos, origDir, true);
+    if (!cmp(pos, result)) result.hitSide = true;
     return result;
   }
 
   // For relative vertical movement. Dir may be -1 or 1. Unit can be
   // "page" or "line". The resulting position will have a hitSide=true
   // property if it reached the end of the document.
   function findPosV(cm, pos, dir, unit) {
     var doc = cm.doc, x = pos.left, y;
     if (unit == "page") {
       var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
@@ skipping 15 matching lines @@
   // The publicly visible API. Note that methodOp(f) means
   // 'wrap f in an operation, performed on its `this` parameter'.
 
   // This is not the complete set of editor methods. Most of the
   // methods defined on the Doc type are also injected into
   // CodeMirror.prototype, for backwards compatibility and
   // convenience.
 
   CodeMirror.prototype = {
     constructor: CodeMirror,
-    focus: function(){window.focus(); focusInput(this); fastPoll(this);},
+    focus: function(){window.focus(); this.display.input.focus();},
 
     setOption: function(option, value) {
       var options = this.options, old = options[option];
       if (options[option] == value && option != "mode") return;
       options[option] = value;
       if (optionHandlers.hasOwnProperty(option))
         operation(this, optionHandlers[option])(this, value, old);
     },
 
     getOption: function(option) {return this.options[option];},
@@ skipping 90 matching lines @@
       if (!mode.innerMode) return mode;
       return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
     },
 
     getHelper: function(pos, type) {
       return this.getHelpers(pos, type)[0];
     },
 
     getHelpers: function(pos, type) {
       var found = [];
-      if (!helpers.hasOwnProperty(type)) return helpers;
+      if (!helpers.hasOwnProperty(type)) return found;
       var help = helpers[type], mode = this.getModeAt(pos);
       if (typeof mode[type] == "string") {
         if (help[mode[type]]) found.push(help[mode[type]]);
       } else if (mode[type]) {
         for (var i = 0; i < mode[type].length; i++) {
           var val = help[mode[type][i]];
           if (val) found.push(val);
         }
       } else if (mode.helperType && help[mode.helperType]) {
         found.push(help[mode.helperType]);
@@ skipping 29 matching lines @@
     coordsChar: function(coords, mode) {
       coords = fromCoordSystem(this, coords, mode || "page");
       return coordsChar(this, coords.left, coords.top);
     },
 
     lineAtHeight: function(height, mode) {
       height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
       return lineAtHeight(this.doc, height + this.display.viewOffset);
     },
     heightAtLine: function(line, mode) {
-      var end = false, last = this.doc.first + this.doc.size - 1;
-      if (line < this.doc.first) line = this.doc.first;
-      else if (line > last) { line = last; end = true; }
-      var lineObj = getLine(this.doc, line);
+      var end = false, lineObj;
+      if (typeof line == "number") {
+        var last = this.doc.first + this.doc.size - 1;
+        if (line < this.doc.first) line = this.doc.first;
+        else if (line > last) { line = last; end = true; }
+        lineObj = getLine(this.doc, line);
+      } else {
+        lineObj = line;
+      }
       return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page").top +
         (end ? this.doc.height - heightAtLine(lineObj) : 0);
     },
 
     defaultTextHeight: function() { return textHeight(this.display); },
     defaultCharWidth: function() { return charWidth(this.display); },
 
     setGutterMarker: methodOp(function(line, gutterID, value) {
       return changeLine(this.doc, line, "gutter", function(line) {
         var markers = line.gutterMarkers || (line.gutterMarkers = {});
         markers[gutterID] = value;
         if (!value && isEmpty(markers)) line.gutterMarkers = null;
         return true;
       });
     }),
 
     clearGutter: methodOp(function(gutterID) {
       var cm = this, doc = cm.doc, i = doc.first;
       doc.iter(function(line) {
         if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
           line.gutterMarkers[gutterID] = null;
           regLineChange(cm, i, "gutter");
           if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
         }
         ++i;
       });
     }),
 
-    addLineWidget: methodOp(function(handle, node, options) {
-      return addLineWidget(this, handle, node, options);
-    }),
-
-    removeLineWidget: function(widget) { widget.clear(); },
-
     lineInfo: function(line) {
       if (typeof line == "number") {
         if (!isLine(this.doc, line)) return null;
         var n = line;
         line = getLine(this.doc, line);
         if (!line) return null;
       } else {
         var n = lineNo(line);
         if (n == null) return null;
       }
       return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
               textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
               widgets: line.widgets};
     },
 
     getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo};},
 
     addWidget: function(pos, node, scroll, vert, horiz) {
       var display = this.display;
       pos = cursorCoords(this, clipPos(this.doc, pos));
       var top = pos.bottom, left = pos.left;
       node.style.position = "absolute";
       node.setAttribute("cm-ignore-events", "true");
+      this.display.input.setUneditable(node);
       display.sizer.appendChild(node);
       if (vert == "over") {
         top = pos.top;
       } else if (vert == "above" || vert == "near") {
         var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
         hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
         // Default to positioning above (if specified and possible); otherwise default to positioning below
         if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
           top = pos.top - node.offsetHeight;
         else if (pos.bottom + node.offsetHeight <= vspace)
@@ skipping 14 matching lines @@
       if (scroll)
         scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
     },
 
     triggerOnKeyDown: methodOp(onKeyDown),
     triggerOnKeyPress: methodOp(onKeyPress),
     triggerOnKeyUp: onKeyUp,
 
     execCommand: function(cmd) {
       if (commands.hasOwnProperty(cmd))
-        return commands[cmd](this);
+        return commands[cmd].call(null, this);
     },
 
+    triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),
+
     findPosH: function(from, amount, unit, visually) {
       var dir = 1;
       if (amount < 0) { dir = -1; amount = -amount; }
       for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
         cur = findPosH(this.doc, cur, dir, unit, visually);
         if (cur.hitSide) break;
       }
       return cur;
     },
 
@@ skipping 69 matching lines @@
 
     toggleOverwrite: function(value) {
       if (value != null && value == this.state.overwrite) return;
       if (this.state.overwrite = !this.state.overwrite)
         addClass(this.display.cursorDiv, "CodeMirror-overwrite");
       else
         rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
 
       signal(this, "overwriteToggle", this, this.state.overwrite);
     },
-    hasFocus: function() { return activeElt() == this.display.input; },
+    hasFocus: function() { return this.display.input.getField() == activeElt(); },
+    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit); },
 
     scrollTo: methodOp(function(x, y) {
       if (x != null || y != null) resolveScrollToPos(this);
       if (x != null) this.curOp.scrollLeft = x;
       if (y != null) this.curOp.scrollTop = y;
     }),
     getScrollInfo: function() {
       var scroller = this.display.scroller;
       return {left: scroller.scrollLeft, top: scroller.scrollTop,
               height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
@@ skipping 55 matching lines @@
       if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
         estimateLineHeights(this);
       signal(this, "refresh", this);
     }),
 
     swapDoc: methodOp(function(doc) {
       var old = this.doc;
       old.cm = null;
       attachDoc(this, doc);
       clearCaches(this);
-      resetInput(this);
+      this.display.input.reset();
       this.scrollTo(doc.scrollLeft, doc.scrollTop);
       this.curOp.forceScroll = true;
       signalLater(this, "swapDoc", this, old);
       return old;
     }),
 
-    getInputField: function(){return this.display.input;},
+    getInputField: function(){return this.display.input.getField();},
     getWrapperElement: function(){return this.display.wrapper;},
     getScrollerElement: function(){return this.display.scroller;},
     getGutterElement: function(){return this.display.gutters;}
   };
   eventMixin(CodeMirror);
 
   // OPTION DEFAULTS
 
   // The default configuration options.
   var defaults = CodeMirror.defaults = {};
@@ skipping 20 matching lines @@
   }, true);
 
   option("indentUnit", 2, loadMode, true);
   option("indentWithTabs", false);
   option("smartIndent", true);
   option("tabSize", 4, function(cm) {
     resetModeState(cm);
     clearCaches(cm);
     regChange(cm);
   }, true);
-  option("specialChars", /[\t\u0000-\u0019\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val) {
-    cm.options.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
-    cm.refresh();
-  }, true);
+  option("lineSeparator", null, function(cm, val) {
+    cm.doc.lineSep = val;
+    if (!val) return;
+    var newBreaks = [], lineNo = cm.doc.first;
+    cm.doc.iter(function(line) {
+      for (var pos = 0;;) {
+        var found = line.text.indexOf(val, pos);
+        if (found == -1) break;
+        pos = found + val.length;
+        newBreaks.push(Pos(lineNo, found));
+      }
+      lineNo++;
+    });
+    for (var i = newBreaks.length - 1; i >= 0; i--)
+      replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length))
+  });
+  option("specialChars", /[\u0000-\u001f\u007f\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
+    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
+    if (old != CodeMirror.Init) cm.refresh();
+  });
   option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {cm.refresh();}, true);
   option("electricChars", true);
+  option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
+    throw new Error("inputStyle can not (yet) be changed in a running editor"); // FIXME
+  }, true);
   option("rtlMoveVisually", !windows);
   option("wholeLineUpdateBefore", true);
 
   option("theme", "default", function(cm) {
     themeChanged(cm);
     guttersChanged(cm);
   }, true);
   option("keyMap", "default", function(cm, val, old) {
     var next = getKeyMap(val);
     var prev = old != CodeMirror.Init && getKeyMap(old);
@@ skipping 20 matching lines @@
   }, true);
   option("lineNumbers", false, function(cm) {
     setGuttersForLineNumbers(cm.options);
     guttersChanged(cm);
   }, true);
   option("firstLineNumber", 1, guttersChanged, true);
   option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
   option("showCursorWhenSelecting", false, updateSelection, true);
 
   option("resetSelectionOnContextMenu", true);
+  option("lineWiseCopyCut", true);
 
   option("readOnly", false, function(cm, val) {
     if (val == "nocursor") {
       onBlur(cm);
       cm.display.input.blur();
       cm.display.disabled = true;
     } else {
       cm.display.disabled = false;
-      if (!val) resetInput(cm);
     }
+    cm.display.input.readOnlyChanged(val)
   });
-  option("disableInput", false, function(cm, val) {if (!val) resetInput(cm);}, true);
-  option("dragDrop", true);
+  option("disableInput", false, function(cm, val) {if (!val) cm.display.input.reset();}, true);
+  option("dragDrop", true, dragDropChanged);
+  option("allowDropFileTypes", null);
 
   option("cursorBlinkRate", 530);
   option("cursorScrollMargin", 0);
   option("cursorHeight", 1, updateSelection, true);
   option("singleCursorHeightPerLine", true, updateSelection, true);
   option("workTime", 100);
   option("workDelay", 100);
   option("flattenSpans", true, resetModeState, true);
   option("addModeClass", false, resetModeState, true);
   option("pollInterval", 100);
   option("undoDepth", 200, function(cm, val){cm.doc.history.undoDepth = val;});
   option("historyEventDelay", 1250);
   option("viewportMargin", 10, function(cm){cm.refresh();}, true);
   option("maxHighlightLength", 10000, resetModeState, true);
   option("moveInputWithCursor", true, function(cm, val) {
-    if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
+    if (!val) cm.display.input.resetPosition();
   });
 
   option("tabindex", null, function(cm, val) {
-    cm.display.input.tabIndex = val || "";
+    cm.display.input.getField().tabIndex = val || "";
   });
   option("autofocus", null);
 
   // MODE DEFINITION AND QUERYING
 
   // Known modes, by name and by MIME
   var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
 
   // Extra arguments are stored as the mode's dependencies, which is
   // used by (legacy) mechanisms like loadmode.js to automatically
@@ skipping 225 matching lines @@
     delGroupAfter: function(cm) {cm.deleteH(1, "group");},
     indentAuto: function(cm) {cm.indentSelection("smart");},
     indentMore: function(cm) {cm.indentSelection("add");},
     indentLess: function(cm) {cm.indentSelection("subtract");},
     insertTab: function(cm) {cm.replaceSelection("\t");},
     insertSoftTab: function(cm) {
       var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
       for (var i = 0; i < ranges.length; i++) {
         var pos = ranges[i].from();
         var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
-        spaces.push(new Array(tabSize - col % tabSize + 1).join(" "));
+        spaces.push(spaceStr(tabSize - col % tabSize));
       }
       cm.replaceSelections(spaces);
     },
     defaultTab: function(cm) {
       if (cm.somethingSelected()) cm.indentSelection("add");
       else cm.execCommand("insertTab");
     },
     transposeChars: function(cm) {
       runInOp(cm, function() {
         var ranges = cm.listSelections(), newSel = [];
         for (var i = 0; i < ranges.length; i++) {
           var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
           if (line) {
             if (cur.ch == line.length) cur = new Pos(cur.line, cur.ch - 1);
             if (cur.ch > 0) {
               cur = new Pos(cur.line, cur.ch + 1);
               cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                               Pos(cur.line, cur.ch - 2), cur, "+transpose");
             } else if (cur.line > cm.doc.first) {
               var prev = getLine(cm.doc, cur.line - 1).text;
               if (prev)
-                cm.replaceRange(line.charAt(0) + "\n" + prev.charAt(prev.length - 1),
+                cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
+                                prev.charAt(prev.length - 1),
                                 Pos(cur.line - 1, prev.length - 1), Pos(cur.line, 1), "+transpose");
             }
           }
           newSel.push(new Range(cur, cur));
         }
         cm.setSelections(newSel);
       });
     },
     newlineAndIndent: function(cm) {
       runInOp(cm, function() {
         var len = cm.listSelections().length;
         for (var i = 0; i < len; i++) {
           var range = cm.listSelections()[i];
-          cm.replaceRange("\n", range.anchor, range.head, "+input");
+          cm.replaceRange(cm.doc.lineSeparator(), range.anchor, range.head, "+input");
           cm.indentLine(range.from().line + 1, null, true);
-          ensureCursorVisible(cm);
         }
+        ensureCursorVisible(cm);
       });
     },
+    openLine: function(cm) {cm.replaceSelection("\n", "start")},
     toggleOverwrite: function(cm) {cm.toggleOverwrite();}
   };
 
 
   // STANDARD KEYMAPS
 
   var keyMap = CodeMirror.keyMap = {};
 
   keyMap.basic = {
     "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
@@ skipping 14 matching lines @@
     "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
     "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
     "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
     fallthrough: "basic"
   };
   // Very basic readline/emacs-style bindings, which are standard on Mac.
   keyMap.emacsy = {
     "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
     "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
     "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
-    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
+    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
+    "Ctrl-O": "openLine"
   };
   keyMap.macDefault = {
     "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
     "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
     "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
     "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
     "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
     "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
     "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
     fallthrough: ["basic", "emacsy"]
@@ skipping 29 matching lines @@
     var copy = {};
     for (var keyname in keymap) if (keymap.hasOwnProperty(keyname)) {
       var value = keymap[keyname];
       if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) continue;
       if (value == "...") { delete keymap[keyname]; continue; }
 
       var keys = map(keyname.split(" "), normalizeKeyName);
       for (var i = 0; i < keys.length; i++) {
         var val, name;
         if (i == keys.length - 1) {
-          name = keyname;
+          name = keys.join(" ");
           val = value;
         } else {
           name = keys.slice(0, i + 1).join(" ");
           val = "...";
         }
         var prev = copy[name];
         if (!prev) copy[name] = val;
         else if (prev != val) throw new Error("Inconsistent bindings for " + name);
       }
       delete keymap[keyname];
@@ skipping 38 matching lines @@
     return name;
   };
 
   function getKeyMap(val) {
     return typeof val == "string" ? keyMap[val] : val;
   }
 
   // FROMTEXTAREA
 
   CodeMirror.fromTextArea = function(textarea, options) {
-    if (!options) options = {};
+    options = options ? copyObj(options) : {};
     options.value = textarea.value;
-    if (!options.tabindex && textarea.tabindex)
-      options.tabindex = textarea.tabindex;
+    if (!options.tabindex && textarea.tabIndex)
+      options.tabindex = textarea.tabIndex;
     if (!options.placeholder && textarea.placeholder)
       options.placeholder = textarea.placeholder;
     // Set autofocus to true if this textarea is focused, or if it has
     // autofocus and no other element is focused.
     if (options.autofocus == null) {
       var hasFocus = activeElt();
       options.autofocus = hasFocus == textarea ||
         textarea.getAttribute("autofocus") != null && hasFocus == document.body;
     }
 
     function save() {textarea.value = cm.getValue();}
     if (textarea.form) {
       on(textarea.form, "submit", save);
       // Deplorable hack to make the submit method do the right thing.
       if (!options.leaveSubmitMethodAlone) {
         var form = textarea.form, realSubmit = form.submit;
         try {
           var wrappedSubmit = form.submit = function() {
             save();
             form.submit = realSubmit;
             form.submit();
             form.submit = wrappedSubmit;
           };
         } catch(e) {}
       }
     }
 
+    options.finishInit = function(cm) {
+      cm.save = save;
+      cm.getTextArea = function() { return textarea; };
+      cm.toTextArea = function() {
+        cm.toTextArea = isNaN; // Prevent this from being ran twice
+        save();
+        textarea.parentNode.removeChild(cm.getWrapperElement());
+        textarea.style.display = "";
+        if (textarea.form) {
+          off(textarea.form, "submit", save);
+          if (typeof textarea.form.submit == "function")
+            textarea.form.submit = realSubmit;
+        }
+      };
+    };
+
     textarea.style.display = "none";
     var cm = CodeMirror(function(node) {
       textarea.parentNode.insertBefore(node, textarea.nextSibling);
     }, options);
-    cm.save = save;
-    cm.getTextArea = function() { return textarea; };
-    cm.toTextArea = function() {
-      cm.toTextArea = isNaN; // Prevent this from being ran twice
-      save();
-      textarea.parentNode.removeChild(cm.getWrapperElement());
-      textarea.style.display = "";
-      if (textarea.form) {
-        off(textarea.form, "submit", save);
-        if (typeof textarea.form.submit == "function")
-          textarea.form.submit = realSubmit;
-      }
-    };
     return cm;
   };
 
   // STRING STREAM
 
   // Fed to the mode parsers, provides helper functions to make
   // parsers more succinct.
 
   var StringStream = CodeMirror.StringStream = function(string, tabSize) {
     this.pos = this.start = 0;
@@ skipping 72 matching lines @@
   // Created with markText and setBookmark methods. A TextMarker is a
   // handle that can be used to clear or find a marked position in the
   // document. Line objects hold arrays (markedSpans) containing
   // {from, to, marker} object pointing to such marker objects, and
   // indicating that such a marker is present on that line. Multiple
   // lines may point to the same marker when it spans across lines.
   // The spans will have null for their from/to properties when the
   // marker continues beyond the start/end of the line. Markers have
   // links back to the lines they currently touch.
 
+  var nextMarkerId = 0;
+
   var TextMarker = CodeMirror.TextMarker = function(doc, type) {
     this.lines = [];
     this.type = type;
     this.doc = doc;
+    this.id = ++nextMarkerId;
   };
   eventMixin(TextMarker);
 
   // Clear the marker.
   TextMarker.prototype.clear = function() {
     if (this.explicitlyCleared) return;
     var cm = this.doc.cm, withOp = cm && !cm.curOp;
     if (withOp) startOperation(cm);
     if (hasHandler(this, "clear")) {
       var found = this.find();
@@ skipping 483 matching lines @@
   function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
     var line = getLine(doc, lineNo);
     var sps = sawCollapsedSpans && line.markedSpans;
     if (sps) for (var i = 0; i < sps.length; ++i) {
       var sp = sps[i];
       if (!sp.marker.collapsed) continue;
       var found = sp.marker.find(0);
       var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
       var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
       if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) continue;
-      if (fromCmp <= 0 && (cmp(found.to, from) > 0 || (sp.marker.inclusiveRight && marker.inclusiveLeft)) ||
-          fromCmp >= 0 && (cmp(found.from, to) < 0 || (sp.marker.inclusiveLeft && marker.inclusiveRight)))
+      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
+          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
         return true;
     }
   }
 
   // A visual line is a line as drawn on the screen. Folding, for
   // example, can cause multiple logical lines to appear on the same
   // visual line. This finds the start of the visual line that the
   // given line is part of (usually that is the line itself).
   function visualLine(line) {
     var merged;
@@ skipping 58 matching lines @@
           (sp.to == null || sp.to != span.from) &&
           (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
           lineIsHiddenInner(doc, line, sp)) return true;
     }
   }
 
   // LINE WIDGETS
 
   // Line widgets are block elements displayed above or below a line.
 
-  var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {
+  var LineWidget = CodeMirror.LineWidget = function(doc, node, options) {
     if (options) for (var opt in options) if (options.hasOwnProperty(opt))
       this[opt] = options[opt];
-    this.cm = cm;
+    this.doc = doc;
     this.node = node;
   };
   eventMixin(LineWidget);
 
   function adjustScrollWhenAboveVisible(cm, line, diff) {
     if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
       addToScrollPos(cm, null, diff);
   }
 
   LineWidget.prototype.clear = function() {
-    var cm = this.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
+    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
     if (no == null || !ws) return;
     for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
     if (!ws.length) line.widgets = null;
     var height = widgetHeight(this);
-    runInOp(cm, function() {
+    updateLineHeight(line, Math.max(0, line.height - height));
+    if (cm) runInOp(cm, function() {
       adjustScrollWhenAboveVisible(cm, line, -height);
       regLineChange(cm, no, "widget");
-      updateLineHeight(line, Math.max(0, line.height - height));
     });
   };
   LineWidget.prototype.changed = function() {
-    var oldH = this.height, cm = this.cm, line = this.line;
+    var oldH = this.height, cm = this.doc.cm, line = this.line;
     this.height = null;
     var diff = widgetHeight(this) - oldH;
     if (!diff) return;
-    runInOp(cm, function() {
+    updateLineHeight(line, line.height + diff);
+    if (cm) runInOp(cm, function() {
       cm.curOp.forceUpdate = true;
       adjustScrollWhenAboveVisible(cm, line, diff);
-      updateLineHeight(line, line.height + diff);
     });
   };
 
   function widgetHeight(widget) {
     if (widget.height != null) return widget.height;
+    var cm = widget.doc.cm;
+    if (!cm) return 0;
     if (!contains(document.body, widget.node)) {
       var parentStyle = "position: relative;";
       if (widget.coverGutter)
-        parentStyle += "margin-left: -" + widget.cm.display.gutters.offsetWidth + "px;";
+        parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
       if (widget.noHScroll)
-        parentStyle += "width: " + widget.cm.display.wrapper.clientWidth + "px;";
-      removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, parentStyle));
+        parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
+      removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
     }
-    return widget.height = widget.node.offsetHeight;
+    return widget.height = widget.node.parentNode.offsetHeight;
   }
 
-  function addLineWidget(cm, handle, node, options) {
-    var widget = new LineWidget(cm, node, options);
-    if (widget.noHScroll) cm.display.alignWidgets = true;
-    changeLine(cm.doc, handle, "widget", function(line) {
+  function addLineWidget(doc, handle, node, options) {
+    var widget = new LineWidget(doc, node, options);
+    var cm = doc.cm;
+    if (cm && widget.noHScroll) cm.display.alignWidgets = true;
+    changeLine(doc, handle, "widget", function(line) {
       var widgets = line.widgets || (line.widgets = []);
       if (widget.insertAt == null) widgets.push(widget);
       else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
       widget.line = line;
-      if (!lineIsHidden(cm.doc, line)) {
-        var aboveVisible = heightAtLine(line) < cm.doc.scrollTop;
+      if (cm && !lineIsHidden(doc, line)) {
+        var aboveVisible = heightAtLine(line) < doc.scrollTop;
         updateLineHeight(line, line.height + widgetHeight(widget));
         if (aboveVisible) addToScrollPos(cm, null, widget.height);
         cm.curOp.forceUpdate = true;
       }
       return true;
     });
     return widget;
   }
 
   // LINE DATA STRUCTURE
@@ skipping 155 matching lines @@
           }
         }
       }, lineClasses);
     }
 
     return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null};
   }
 
   function getLineStyles(cm, line, updateFrontier) {
     if (!line.styles || line.styles[0] != cm.state.modeGen) {
-      var result = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
+      var state = getStateBefore(cm, lineNo(line));
+      var result = highlightLine(cm, line, line.text.length > cm.options.maxHighlightLength ? copyState(cm.doc.mode, state) : state);
+      line.stateAfter = state;
       line.styles = result.styles;
       if (result.classes) line.styleClasses = result.classes;
       else if (line.styleClasses) line.styleClasses = null;
       if (updateFrontier === cm.doc.frontier) cm.doc.frontier++;
     }
     return line.styles;
   }
 
   // Lightweight form of highlight -- proceed over this line and
   // update state, but don't save a style array. Used for lines that
   // aren't currently visible.
   function processLine(cm, text, state, startAt) {
     var mode = cm.doc.mode;
     var stream = new StringStream(text, cm.options.tabSize);
     stream.start = stream.pos = startAt || 0;
     if (text == "") callBlankLine(mode, state);
-    while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
+    while (!stream.eol()) {
       readToken(mode, stream, state);
       stream.start = stream.pos;
     }
   }
 
   // Convert a style as returned by a mode (either null, or a string
   // containing one or more styles) to a CSS style. This is cached,
   // and also looks for line-wide styles.
   var styleToClassCache = {}, styleToClassCacheWithMode = {};
   function interpretTokenStyle(style, options) {
     if (!style || /^\s*$/.test(style)) return null;
     var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
     return cache[style] ||
       (cache[style] = style.replace(/\S+/g, "cm-$&"));
   }
 
   // Render the DOM representation of the text of a line. Also builds
   // up a 'line map', which points at the DOM nodes that represent
   // specific stretches of text, and is used by the measuring code.
   // The returned object contains the DOM node, this map, and
   // information about line-wide styles that were set by the mode.
   function buildLineContent(cm, lineView) {
     // The padding-right forces the element to have a 'border', which
     // is needed on Webkit to be able to get line-level bounding
     // rectangles for it (in measureChar).
     var content = elt("span", null, null, webkit ? "padding-right: .1px" : null);
-    var builder = {pre: elt("pre", [content]), content: content, col: 0, pos: 0, cm: cm};
+    var builder = {pre: elt("pre", [content], "CodeMirror-line"), content: content,
+                   col: 0, pos: 0, cm: cm,
+                   trailingSpace: false,
+                   splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")};
     lineView.measure = {};
 
     // Iterate over the logical lines that make up this visual line.
     for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
       var line = i ? lineView.rest[i - 1] : lineView.line, order;
       builder.pos = 0;
       builder.addToken = buildToken;
       // Optionally wire in some hacks into the token-rendering
       // algorithm, to deal with browser quirks.
-      if ((ie || webkit) && cm.getOption("lineWrapping"))
-        builder.addToken = buildTokenSplitSpaces(builder.addToken);
       if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line)))
         builder.addToken = buildTokenBadBidi(builder.addToken, order);
       builder.map = [];
       var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
       insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
       if (line.styleClasses) {
         if (line.styleClasses.bgClass)
           builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
         if (line.styleClasses.textClass)
           builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
       }
 
       // Ensure at least a single node is present, for measuring.
       if (builder.map.length == 0)
         builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
 
       // Store the map and a cache object for the current logical line
       if (i == 0) {
         lineView.measure.map = builder.map;
         lineView.measure.cache = {};
       } else {
         (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
         (lineView.measure.caches || (lineView.measure.caches = [])).push({});
       }
     }
 
     // See issue #2901
-    if (webkit && /\bcm-tab\b/.test(builder.content.lastChild.className))
-      builder.content.className = "cm-tab-wrap-hack";
+    if (webkit) {
+      var last = builder.content.lastChild
+      if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
+        builder.content.className = "cm-tab-wrap-hack";
+    }
 
     signal(cm, "renderLine", cm, lineView.line, builder.pre);
     if (builder.pre.className)
       builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
 
     return builder;
   }
 
   function defaultSpecialCharPlaceholder(ch) {
     var token = elt("span", "\u2022", "cm-invalidchar");
     token.title = "\\u" + ch.charCodeAt(0).toString(16);
+    token.setAttribute("aria-label", token.title);
     return token;
   }
 
   // Build up the DOM representation for a single token, and add it to
   // the line map. Takes care to render special characters separately.
   function buildToken(builder, text, style, startStyle, endStyle, title, css) {
     if (!text) return;
-    var special = builder.cm.options.specialChars, mustWrap = false;
+    var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text
+    var special = builder.cm.state.specialChars, mustWrap = false;
     if (!special.test(text)) {
       builder.col += text.length;
-      var content = document.createTextNode(text);
+      var content = document.createTextNode(displayText);
       builder.map.push(builder.pos, builder.pos + text.length, content);
       if (ie && ie_version < 9) mustWrap = true;
       builder.pos += text.length;
     } else {
       var content = document.createDocumentFragment(), pos = 0;
       while (true) {
         special.lastIndex = pos;
         var m = special.exec(text);
         var skipped = m ? m.index - pos : text.length - pos;
         if (skipped) {
-          var txt = document.createTextNode(text.slice(pos, pos + skipped));
+          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
           if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
           else content.appendChild(txt);
           builder.map.push(builder.pos, builder.pos + skipped, txt);
           builder.col += skipped;
           builder.pos += skipped;
         }
         if (!m) break;
         pos += skipped + 1;
         if (m[0] == "\t") {
           var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
           var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
+          txt.setAttribute("role", "presentation");
+          txt.setAttribute("cm-text", "\t");
           builder.col += tabWidth;
+        } else if (m[0] == "\r" || m[0] == "\n") {
+          var txt = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
+          txt.setAttribute("cm-text", m[0]);
+          builder.col += 1;
         } else {
           var txt = builder.cm.options.specialCharPlaceholder(m[0]);
+          txt.setAttribute("cm-text", m[0]);
           if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
           else content.appendChild(txt);
           builder.col += 1;
         }
         builder.map.push(builder.pos, builder.pos + 1, txt);
         builder.pos++;
       }
     }
+    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32
     if (style || startStyle || endStyle || mustWrap || css) {
       var fullStyle = style || "";
       if (startStyle) fullStyle += startStyle;
       if (endStyle) fullStyle += endStyle;
       var token = elt("span", [content], fullStyle, css);
       if (title) token.title = title;
       return builder.content.appendChild(token);
     }
     builder.content.appendChild(content);
   }
 
-  function buildTokenSplitSpaces(inner) {
-    function split(old) {
-      var out = " ";
-      for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
-      out += " ";
-      return out;
+  function splitSpaces(text, trailingBefore) {
+    if (text.length > 1 && !/  /.test(text)) return text
+    var spaceBefore = trailingBefore, result = ""
+    for (var i = 0; i < text.length; i++) {
+      var ch = text.charAt(i)
+      if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
+        ch = "\u00a0"
+      result += ch
+      spaceBefore = ch == " "
     }
-    return function(builder, text, style, startStyle, endStyle, title) {
-      inner(builder, text.replace(/ {3,}/g, split), style, startStyle, endStyle, title);
-    };
+    return result
   }
 
   // Work around nonsense dimensions being reported for stretches of
   // right-to-left text.
   function buildTokenBadBidi(inner, order) {
-    return function(builder, text, style, startStyle, endStyle, title) {
+    return function(builder, text, style, startStyle, endStyle, title, css) {
       style = style ? style + " cm-force-border" : "cm-force-border";
       var start = builder.pos, end = start + text.length;
       for (;;) {
         // Find the part that overlaps with the start of this text
         for (var i = 0; i < order.length; i++) {
           var part = order[i];
           if (part.to > start && part.from <= start) break;
         }
-        if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title);
-        inner(builder, text.slice(0, part.to - start), style, startStyle, null, title);
+        if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title, css);
+        inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
         startStyle = null;
         text = text.slice(part.to - start);
         start = part.to;
       }
     };
   }
 
   function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
     var widget = !ignoreWidget && marker.widgetNode;
+    if (widget) builder.map.push(builder.pos, builder.pos + size, widget);
+    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
+      if (!widget)
+        widget = builder.content.appendChild(document.createElement("span"));
+      widget.setAttribute("cm-marker", marker.id);
+    }
     if (widget) {
-      builder.map.push(builder.pos, builder.pos + size, widget);
+      builder.cm.display.input.setUneditable(widget);
       builder.content.appendChild(widget);
     }
     builder.pos += size;
+    builder.trailingSpace = false
   }
 
   // Outputs a number of spans to make up a line, taking highlighting
   // and marked text into account.
   function insertLineContent(line, builder, styles) {
     var spans = line.markedSpans, allText = line.text, at = 0;
     if (!spans) {
       for (var i = 1; i < styles.length; i+=2)
         builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i+1], builder.cm.options));
       return;
     }
 
     var len = allText.length, pos = 0, i = 1, text = "", style, css;
     var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
     for (;;) {
       if (nextChange == pos) { // Update current marker set
         spanStyle = spanEndStyle = spanStartStyle = title = css = "";
         collapsed = null; nextChange = Infinity;
-        var foundBookmarks = [];
+        var foundBookmarks = [], endStyles
         for (var j = 0; j < spans.length; ++j) {
           var sp = spans[j], m = sp.marker;
-          if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
-            if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }
+          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
+            foundBookmarks.push(m);
+          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
+            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
+              nextChange = sp.to;
+              spanEndStyle = "";
+            }
             if (m.className) spanStyle += " " + m.className;
-            if (m.css) css = m.css;
+            if (m.css) css = (css ? css + ";" : "") + m.css;
             if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
-            if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
+            if (m.endStyle && sp.to == nextChange) (endStyles || (endStyles = [])).push(m.endStyle, sp.to)
             if (m.title && !title) title = m.title;
             if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
               collapsed = sp;
           } else if (sp.from > pos && nextChange > sp.from) {
             nextChange = sp.from;
           }
-          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) foundBookmarks.push(m);
         }
+        if (endStyles) for (var j = 0; j < endStyles.length; j += 2)
+          if (endStyles[j + 1] == nextChange) spanEndStyle += " " + endStyles[j]
+
+        if (!collapsed || collapsed.from == pos) for (var j = 0; j < foundBookmarks.length; ++j)
+          buildCollapsedSpan(builder, 0, foundBookmarks[j]);
         if (collapsed && (collapsed.from || 0) == pos) {
           buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                              collapsed.marker, collapsed.from == null);
           if (collapsed.to == null) return;
+          if (collapsed.to == pos) collapsed = false;
         }
-        if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)
-          buildCollapsedSpan(builder, 0, foundBookmarks[j]);
       }
       if (pos >= len) break;
 
       var upto = Math.min(len, nextChange);
       while (true) {
         if (text) {
           var end = pos + text.length;
           if (!collapsed) {
             var tokenText = end > upto ? text.slice(0, upto - pos) : text;
             builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
@@ skipping 165 matching lines @@
       for (var i = 0; i < this.children.length; ++i) this.children[i].collapse(lines);
     },
     insertInner: function(at, lines, height) {
       this.size += lines.length;
       this.height += height;
       for (var i = 0; i < this.children.length; ++i) {
         var child = this.children[i], sz = child.chunkSize();
         if (at <= sz) {
           child.insertInner(at, lines, height);
           if (child.lines && child.lines.length > 50) {
-            while (child.lines.length > 50) {
-              var spilled = child.lines.splice(child.lines.length - 25, 25);
-              var newleaf = new LeafChunk(spilled);
-              child.height -= newleaf.height;
-              this.children.splice(i + 1, 0, newleaf);
-              newleaf.parent = this;
+            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
+            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
+            var remaining = child.lines.length % 25 + 25
+            for (var pos = remaining; pos < child.lines.length;) {
+              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
+              child.height -= leaf.height;
+              this.children.splice(++i, 0, leaf);
+              leaf.parent = this;
             }
+            child.lines = child.lines.slice(0, remaining);
             this.maybeSpill();
           }
           break;
         }
         at -= sz;
       }
     },
     // When a node has grown, check whether it should be split.
     maybeSpill: function() {
       if (this.children.length <= 10) return;
       var me = this;
       do {
         var spilled = me.children.splice(me.children.length - 5, 5);
         var sibling = new BranchChunk(spilled);
         if (!me.parent) { // Become the parent node
           var copy = new BranchChunk(me.children);
           copy.parent = me;
           me.children = [copy, sibling];
           me = copy;
-        } else {
+       } else {
           me.size -= sibling.size;
           me.height -= sibling.height;
           var myIndex = indexOf(me.parent.children, me);
           me.parent.children.splice(myIndex + 1, 0, sibling);
         }
         sibling.parent = me.parent;
       } while (me.children.length > 10);
       me.parent.maybeSpill();
     },
     iterN: function(at, n, op) {
       for (var i = 0; i < this.children.length; ++i) {
         var child = this.children[i], sz = child.chunkSize();
         if (at < sz) {
           var used = Math.min(n, sz - at);
           if (child.iterN(at, used, op)) return true;
           if ((n -= used) == 0) break;
           at = 0;
         } else at -= sz;
       }
     }
   };
 
   var nextDocId = 0;
-  var Doc = CodeMirror.Doc = function(text, mode, firstLine) {
-    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);
+  var Doc = CodeMirror.Doc = function(text, mode, firstLine, lineSep) {
+    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine, lineSep);
     if (firstLine == null) firstLine = 0;
 
     BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
     this.first = firstLine;
     this.scrollTop = this.scrollLeft = 0;
     this.cantEdit = false;
     this.cleanGeneration = 1;
     this.frontier = firstLine;
     var start = Pos(firstLine, 0);
     this.sel = simpleSelection(start);
     this.history = new History(null);
     this.id = ++nextDocId;
     this.modeOption = mode;
+    this.lineSep = lineSep;
+    this.extend = false;
 
-    if (typeof text == "string") text = splitLines(text);
+    if (typeof text == "string") text = this.splitLines(text);
     updateDoc(this, {from: start, to: start, text: text});
     setSelection(this, simpleSelection(start), sel_dontScroll);
   };
 
   Doc.prototype = createObj(BranchChunk.prototype, {
     constructor: Doc,
     // Iterate over the document. Supports two forms -- with only one
     // argument, it calls that for each line in the document. With
     // three, it iterates over the range given by the first two (with
     // the second being non-inclusive).
     iter: function(from, to, op) {
       if (op) this.iterN(from - this.first, to - from, op);
       else this.iterN(this.first, this.first + this.size, from);
     },
 
     // Non-public interface for adding and removing lines.
     insert: function(at, lines) {
       var height = 0;
       for (var i = 0; i < lines.length; ++i) height += lines[i].height;
       this.insertInner(at - this.first, lines, height);
     },
     remove: function(at, n) { this.removeInner(at - this.first, n); },
 
     // From here, the methods are part of the public interface. Most
     // are also available from CodeMirror (editor) instances.
 
     getValue: function(lineSep) {
       var lines = getLines(this, this.first, this.first + this.size);
       if (lineSep === false) return lines;
-      return lines.join(lineSep || "\n");
+      return lines.join(lineSep || this.lineSeparator());
     },
     setValue: docMethodOp(function(code) {
       var top = Pos(this.first, 0), last = this.first + this.size - 1;
       makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
-                        text: splitLines(code), origin: "setValue", full: true}, true);
+                        text: this.splitLines(code), origin: "setValue", full: true}, true);
       setSelection(this, simpleSelection(top));
     }),
     replaceRange: function(code, from, to, origin) {
       from = clipPos(this, from);
       to = to ? clipPos(this, to) : from;
       replaceRange(this, code, from, to, origin);
     },
     getRange: function(from, to, lineSep) {
       var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
       if (lineSep === false) return lines;
-      return lines.join(lineSep || "\n");
+      return lines.join(lineSep || this.lineSeparator());
     },
 
     getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
 
     getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
     getLineNumber: function(line) {return lineNo(line);},
 
     getLineHandleVisualStart: function(line) {
       if (typeof line == "number") line = getLine(this, line);
       return visualLine(line);
@@ skipping 19 matching lines @@
     setCursor: docMethodOp(function(line, ch, options) {
       setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
     }),
     setSelection: docMethodOp(function(anchor, head, options) {
       setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
     }),
     extendSelection: docMethodOp(function(head, other, options) {
       extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
     }),
     extendSelections: docMethodOp(function(heads, options) {
-      extendSelections(this, clipPosArray(this, heads, options));
+      extendSelections(this, clipPosArray(this, heads), options);
     }),
     extendSelectionsBy: docMethodOp(function(f, options) {
-      extendSelections(this, map(this.sel.ranges, f), options);
+      var heads = map(this.sel.ranges, f);
+      extendSelections(this, clipPosArray(this, heads), options);
     }),
     setSelections: docMethodOp(function(ranges, primary, options) {
       if (!ranges.length) return;
       for (var i = 0, out = []; i < ranges.length; i++)
         out[i] = new Range(clipPos(this, ranges[i].anchor),
                            clipPos(this, ranges[i].head));
       if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
       setSelection(this, normalizeSelection(out, primary), options);
     }),
     addSelection: docMethodOp(function(anchor, head, options) {
       var ranges = this.sel.ranges.slice(0);
       ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
       setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
     }),
 
     getSelection: function(lineSep) {
       var ranges = this.sel.ranges, lines;
       for (var i = 0; i < ranges.length; i++) {
         var sel = getBetween(this, ranges[i].from(), ranges[i].to());
         lines = lines ? lines.concat(sel) : sel;
       }
       if (lineSep === false) return lines;
-      else return lines.join(lineSep || "\n");
+      else return lines.join(lineSep || this.lineSeparator());
     },
     getSelections: function(lineSep) {
       var parts = [], ranges = this.sel.ranges;
       for (var i = 0; i < ranges.length; i++) {
         var sel = getBetween(this, ranges[i].from(), ranges[i].to());
-        if (lineSep !== false) sel = sel.join(lineSep || "\n");
+        if (lineSep !== false) sel = sel.join(lineSep || this.lineSeparator());
         parts[i] = sel;
       }
       return parts;
     },
     replaceSelection: function(code, collapse, origin) {
       var dup = [];
       for (var i = 0; i < this.sel.ranges.length; i++)
         dup[i] = code;
       this.replaceSelections(dup, collapse, origin || "+input");
     },
     replaceSelections: docMethodOp(function(code, collapse, origin) {
       var changes = [], sel = this.sel;
       for (var i = 0; i < sel.ranges.length; i++) {
         var range = sel.ranges[i];
-        changes[i] = {from: range.from(), to: range.to(), text: splitLines(code[i]), origin: origin};
+        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
       }
       var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
       for (var i = changes.length - 1; i >= 0; i--)
         makeChange(this, changes[i]);
       if (newSel) setSelectionReplaceHistory(this, newSel);
       else if (this.cm) ensureCursorVisible(this.cm);
     }),
     undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
     redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
     undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
@@ skipping 54 matching lines @@
         else {
           var found = cur.match(classTest(cls));
           if (!found) return false;
           var end = found.index + found[0].length;
           line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
         }
         return true;
       });
     }),
 
+    addLineWidget: docMethodOp(function(handle, node, options) {
+      return addLineWidget(this, handle, node, options);
+    }),
+    removeLineWidget: function(widget) { widget.clear(); },
+
     markText: function(from, to, options) {
-      return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
+      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range");
     },
     setBookmark: function(pos, options) {
       var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
                       insertLeft: options && options.insertLeft,
-                      clearWhenEmpty: false, shared: options && options.shared};
+                      clearWhenEmpty: false, shared: options && options.shared,
+                      handleMouseEvents: options && options.handleMouseEvents};
       pos = clipPos(this, pos);
       return markText(this, pos, pos, realOpts, "bookmark");
     },
     findMarksAt: function(pos) {
       pos = clipPos(this, pos);
       var markers = [], spans = getLine(this, pos.line).markedSpans;
       if (spans) for (var i = 0; i < spans.length; ++i) {
         var span = spans[i];
         if ((span.from == null || span.from <= pos.ch) &&
             (span.to == null || span.to >= pos.ch))
           markers.push(span.marker.parent || span.marker);
       }
       return markers;
     },
     findMarks: function(from, to, filter) {
       from = clipPos(this, from); to = clipPos(this, to);
       var found = [], lineNo = from.line;
       this.iter(from.line, to.line + 1, function(line) {
         var spans = line.markedSpans;
         if (spans) for (var i = 0; i < spans.length; i++) {
           var span = spans[i];
-          if (!(lineNo == from.line && from.ch > span.to ||
-                span.from == null && lineNo != from.line||
-                lineNo == to.line && span.from > to.ch) &&
+          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
+                span.from == null && lineNo != from.line ||
+                span.from != null && lineNo == to.line && span.from >= to.ch) &&
               (!filter || filter(span.marker)))
             found.push(span.marker.parent || span.marker);
         }
         ++lineNo;
       });
       return found;
     },
     getAllMarks: function() {
       var markers = [];
       this.iter(function(line) {
         var sps = line.markedSpans;
         if (sps) for (var i = 0; i < sps.length; ++i)
           if (sps[i].from != null) markers.push(sps[i].marker);
       });
       return markers;
     },
 
     posFromIndex: function(off) {
-      var ch, lineNo = this.first;
+      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
       this.iter(function(line) {
-        var sz = line.text.length + 1;
+        var sz = line.text.length + sepSize;
         if (sz > off) { ch = off; return true; }
         off -= sz;
         ++lineNo;
       });
       return clipPos(this, Pos(lineNo, ch));
     },
     indexFromPos: function (coords) {
       coords = clipPos(this, coords);
       var index = coords.ch;
       if (coords.line < this.first || coords.ch < 0) return 0;
+      var sepSize = this.lineSeparator().length;
       this.iter(this.first, coords.line, function (line) {
-        index += line.text.length + 1;
+        index += line.text.length + sepSize;
       });
       return index;
     },
 
     copy: function(copyHistory) {
-      var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
+      var doc = new Doc(getLines(this, this.first, this.first + this.size),
+                        this.modeOption, this.first, this.lineSep);
       doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
       doc.sel = this.sel;
       doc.extend = false;
       if (copyHistory) {
         doc.history.undoDepth = this.history.undoDepth;
         doc.setHistory(this.getHistory());
       }
       return doc;
     },
 
     linkedDoc: function(options) {
       if (!options) options = {};
       var from = this.first, to = this.first + this.size;
       if (options.from != null && options.from > from) from = options.from;
       if (options.to != null && options.to < to) to = options.to;
-      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
+      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep);
       if (options.sharedHist) copy.history = this.history;
       (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
       copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
       copySharedMarkers(copy, findSharedMarkers(this));
       return copy;
     },
     unlinkDoc: function(other) {
       if (other instanceof CodeMirror) other = other.doc;
       if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
         var link = this.linked[i];
         if (link.doc != other) continue;
         this.linked.splice(i, 1);
         other.unlinkDoc(this);
         detachSharedMarkers(findSharedMarkers(this));
         break;
       }
       // If the histories were shared, split them again
       if (other.history == this.history) {
         var splitIds = [other.id];
         linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
         other.history = new History(null);
         other.history.done = copyHistoryArray(this.history.done, splitIds);
         other.history.undone = copyHistoryArray(this.history.undone, splitIds);
       }
     },
     iterLinkedDocs: function(f) {linkedDocs(this, f);},
 
     getMode: function() {return this.mode;},
-    getEditor: function() {return this.cm;}
+    getEditor: function() {return this.cm;},
+
+    splitLines: function(str) {
+      if (this.lineSep) return str.split(this.lineSep);
+      return splitLinesAuto(str);
+    },
+    lineSeparator: function() { return this.lineSep || "\n"; }
   });
 
   // Public alias.
   Doc.prototype.eachLine = Doc.prototype.iter;
 
   // Set up methods on CodeMirror's prototype to redirect to the editor's document.
-  var dontDelegate = "iter insert remove copy getEditor".split(" ");
+  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
   for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
     CodeMirror.prototype[prop] = (function(method) {
       return function() {return method.apply(this.doc, arguments);};
     })(Doc.prototype[prop]);
 
   eventMixin(Doc);
 
   // Call f for all linked documents.
   function linkedDocs(doc, f, sharedHistOnly) {
     function propagate(doc, skip, sharedHist) {
@@ skipping 412 matching lines @@
       emitter.addEventListener(type, f, false);
     else if (emitter.attachEvent)
       emitter.attachEvent("on" + type, f);
     else {
       var map = emitter._handlers || (emitter._handlers = {});
       var arr = map[type] || (map[type] = []);
       arr.push(f);
     }
   };
 
+  var noHandlers = []
+  function getHandlers(emitter, type, copy) {
+    var arr = emitter._handlers && emitter._handlers[type]
+    if (copy) return arr && arr.length > 0 ? arr.slice() : noHandlers
+    else return arr || noHandlers
+  }
+
   var off = CodeMirror.off = function(emitter, type, f) {
     if (emitter.removeEventListener)
       emitter.removeEventListener(type, f, false);
     else if (emitter.detachEvent)
       emitter.detachEvent("on" + type, f);
     else {
-      var arr = emitter._handlers && emitter._handlers[type];
-      if (!arr) return;
-      for (var i = 0; i < arr.length; ++i)
-        if (arr[i] == f) { arr.splice(i, 1); break; }
+      var handlers = getHandlers(emitter, type, false)
+      for (var i = 0; i < handlers.length; ++i)
+        if (handlers[i] == f) { handlers.splice(i, 1); break; }
     }
   };
 
   var signal = CodeMirror.signal = function(emitter, type /*, values...*/) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    if (!arr) return;
+    var handlers = getHandlers(emitter, type, true)
+    if (!handlers.length) return;
     var args = Array.prototype.slice.call(arguments, 2);
-    for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
+    for (var i = 0; i < handlers.length; ++i) handlers[i].apply(null, args);
   };
 
   var orphanDelayedCallbacks = null;
 
   // Often, we want to signal events at a point where we are in the
   // middle of some work, but don't want the handler to start calling
   // other methods on the editor, which might be in an inconsistent
   // state or simply not expect any other events to happen.
   // signalLater looks whether there are any handlers, and schedules
   // them to be executed when the last operation ends, or, if no
   // operation is active, when a timeout fires.
   function signalLater(emitter, type /*, values...*/) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    if (!arr) return;
+    var arr = getHandlers(emitter, type, false)
+    if (!arr.length) return;
     var args = Array.prototype.slice.call(arguments, 2), list;
     if (operationGroup) {
       list = operationGroup.delayedCallbacks;
     } else if (orphanDelayedCallbacks) {
       list = orphanDelayedCallbacks;
     } else {
       list = orphanDelayedCallbacks = [];
       setTimeout(fireOrphanDelayed, 0);
     }
     function bnd(f) {return function(){f.apply(null, args);};};
@@ skipping 19 matching lines @@
 
   function signalCursorActivity(cm) {
     var arr = cm._handlers && cm._handlers.cursorActivity;
     if (!arr) return;
     var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
     for (var i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
       set.push(arr[i]);
   }
 
   function hasHandler(emitter, type) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    return arr && arr.length > 0;
+    return getHandlers(emitter, type).length > 0
   }
 
   // Add on and off methods to a constructor's prototype, to make
   // registering events on such objects more convenient.
   function eventMixin(ctor) {
     ctor.prototype.on = function(type, f) {on(this, type, f);};
     ctor.prototype.off = function(type, f) {off(this, type, f);};
   }
 
   // MISC UTILITIES
@@ skipping 26 matching lines @@
       if (nextTab < 0 || nextTab >= end)
         return n + (end - i);
       n += nextTab - i;
       n += tabSize - (n % tabSize);
       i = nextTab + 1;
     }
   };
 
   // The inverse of countColumn -- find the offset that corresponds to
   // a particular column.
-  function findColumn(string, goal, tabSize) {
+  var findColumn = CodeMirror.findColumn = function(string, goal, tabSize) {
     for (var pos = 0, col = 0;;) {
       var nextTab = string.indexOf("\t", pos);
       if (nextTab == -1) nextTab = string.length;
       var skipped = nextTab - pos;
       if (nextTab == string.length || col + skipped >= goal)
         return pos + Math.min(skipped, goal - col);
       col += nextTab - pos;
       col += tabSize - (col % tabSize);
       pos = nextTab + 1;
       if (col >= goal) return pos;
@@ skipping 19 matching lines @@
     for (var i = 0; i < array.length; ++i)
       if (array[i] == elt) return i;
     return -1;
   }
   function map(array, f) {
     var out = [];
     for (var i = 0; i < array.length; i++) out[i] = f(array[i], i);
     return out;
   }
 
+  function nothing() {}
+
   function createObj(base, props) {
     var inst;
     if (Object.create) {
       inst = Object.create(base);
     } else {
-      var ctor = function() {};
-      ctor.prototype = base;
-      inst = new ctor();
+      nothing.prototype = base;
+      inst = new nothing();
     }
     if (props) copyObj(props, inst);
     return inst;
   };
 
   function copyObj(obj, target, overwrite) {
     if (!target) target = {};
     for (var prop in obj)
       if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
         target[prop] = obj[prop];
     return target;
   }
 
   function bind(f) {
     var args = Array.prototype.slice.call(arguments, 1);
     return function(){return f.apply(null, args);};
   }
 
-  var nonASCIISingleCaseWordChar = /[\u00df\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
+  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
   var isWordCharBasic = CodeMirror.isWordChar = function(ch) {
     return /\w/.test(ch) || ch > "\x80" &&
       (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
   };
   function isWordChar(ch, helper) {
     if (!helper) return isWordCharBasic(ch);
     if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) return true;
     return helper.test(ch);
   }
 
@@ skipping 15 matching lines @@
   function elt(tag, content, className, style) {
     var e = document.createElement(tag);
     if (className) e.className = className;
     if (style) e.style.cssText = style;
     if (typeof content == "string") e.appendChild(document.createTextNode(content));
     else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
     return e;
   }
 
   var range;
-  if (document.createRange) range = function(node, start, end) {
+  if (document.createRange) range = function(node, start, end, endNode) {
     var r = document.createRange();
-    r.setEnd(node, end);
+    r.setEnd(endNode || node, end);
     r.setStart(node, start);
     return r;
   };
   else range = function(node, start, end) {
     var r = document.body.createTextRange();
     try { r.moveToElementText(node.parentNode); }
     catch(e) { return r; }
     r.collapse(true);
     r.moveEnd("character", end);
     r.moveStart("character", start);
     return r;
   };
 
   function removeChildren(e) {
     for (var count = e.childNodes.length; count > 0; --count)
       e.removeChild(e.firstChild);
     return e;
   }
 
   function removeChildrenAndAdd(parent, e) {
     return removeChildren(parent).appendChild(e);
   }
 
-  function contains(parent, child) {
+  var contains = CodeMirror.contains = function(parent, child) {
+    if (child.nodeType == 3) // Android browser always returns false when child is a textnode
+      child = child.parentNode;
     if (parent.contains)
       return parent.contains(child);
-    while (child = child.parentNode)
+    do {
+      if (child.nodeType == 11) child = child.host;
       if (child == parent) return true;
+    } while (child = child.parentNode);
+  };
+
+  function activeElt() {
+    var activeElement = document.activeElement;
+    while (activeElement && activeElement.root && activeElement.root.activeElement)
+      activeElement = activeElement.root.activeElement;
+    return activeElement;
   }
-
-  function activeElt() { return document.activeElement; }
   // Older versions of IE throws unspecified error when touching
   // document.activeElement in some cases (during loading, in iframe)
   if (ie && ie_version < 11) activeElt = function() {
     try { return document.activeElement; }
     catch(e) { return document.body; }
   };
 
   function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*"); }
   var rmClass = CodeMirror.rmClass = function(node, cls) {
     var current = node.className;
@@ skipping 62 matching lines @@
   }();
 
   var zwspSupported;
   function zeroWidthElement(measure) {
     if (zwspSupported == null) {
       var test = elt("span", "\u200b");
       removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
       if (measure.firstChild.offsetHeight != 0)
         zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
     }
-    if (zwspSupported) return elt("span", "\u200b");
-    else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
+    var node = zwspSupported ? elt("span", "\u200b") :
+      elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
+    node.setAttribute("cm-text", "");
+    return node;
   }
 
   // Feature-detect IE's crummy client rect reporting for bidi text
   var badBidiRects;
   function hasBadBidiRects(measure) {
     if (badBidiRects != null) return badBidiRects;
     var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
     var r0 = range(txt, 0, 1).getBoundingClientRect();
+    var r1 = range(txt, 1, 2).getBoundingClientRect();
+    removeChildren(measure);
     if (!r0 || r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
-    var r1 = range(txt, 1, 2).getBoundingClientRect();
     return badBidiRects = (r1.right - r0.right < 3);
   }
 
   // See if "".split is the broken IE version, if so, provide an
   // alternative way to split lines.
-  var splitLines = CodeMirror.splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
+  var splitLinesAuto = CodeMirror.splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
     var pos = 0, result = [], l = string.length;
     while (pos <= l) {
       var nl = string.indexOf("\n", pos);
       if (nl == -1) nl = string.length;
       var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
       var rt = line.indexOf("\r");
       if (rt != -1) {
         result.push(line.slice(0, rt));
         pos += rt + 1;
       } else {
@@ skipping 25 matching lines @@
   function hasBadZoomedRects(measure) {
     if (badZoomedRects != null) return badZoomedRects;
     var node = removeChildrenAndAdd(measure, elt("span", "x"));
     var normal = node.getBoundingClientRect();
     var fromRange = range(node, 0, 1).getBoundingClientRect();
     return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1;
   }
 
   // KEY NAMES
 
-  var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
-                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
-                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
-                  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod", 107: "=", 109: "-", 127: "Delete",
-                  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
-                  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
-                  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"};
-  CodeMirror.keyNames = keyNames;
+  var keyNames = CodeMirror.keyNames = {
+    3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
+    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
+    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
+    46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
+    106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete",
+    173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
+    221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
+    63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
+  };
   (function() {
     // Number keys
     for (var i = 0; i < 10; i++) keyNames[i + 48] = keyNames[i + 96] = String(i);
     // Alphabetic keys
     for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
     // Function keys
     for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
   })();
 
   // BIDI HELPERS
@@ skipping 273 matching lines @@
         }
       }
       if (order[0].level == 1 && (m = str.match(/^\s+/))) {
         order[0].from = m[0].length;
         order.unshift(new BidiSpan(0, 0, m[0].length));
       }
       if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
         lst(order).to -= m[0].length;
         order.push(new BidiSpan(0, len - m[0].length, len));
       }
+      if (order[0].level == 2)
+        order.unshift(new BidiSpan(1, order[0].to, order[0].to));
       if (order[0].level != lst(order).level)
         order.push(new BidiSpan(order[0].level, len, len));
 
       return order;
     };
   })();
 
   // THE END
 
-  CodeMirror.version = "4.12.0";
+  CodeMirror.version = "5.17.1";
 
   return CodeMirror;
-});
+});