Revert of DevTools: fix stick to bottom in console viewport

third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js

Index: third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js b/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
index 270bbe0eb582db074e3fbe2d4c08d78e2a7bee9c..1c057b0091fc9b1669ae0b1d40af2b4dc885b432 100644
--- a/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
+++ b/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
@@ -136,7 +136,6 @@
     this._prompt.renderAsBlock();
     var proxyElement = this._prompt.attach(this._promptElement);
     proxyElement.addEventListener("keydown", this._promptKeyDown.bind(this), false);
-    proxyElement.addEventListener("input", this._promptInput.bind(this), false);
 
     this._consoleHistorySetting = WebInspector.settings.createLocalSetting("consoleHistory", []);
     var historyData = this._consoleHistorySetting.get();
@@ -155,11 +154,6 @@
     this._initConsoleMessages();
 
     WebInspector.context.addFlavorChangeListener(WebInspector.ExecutionContext, this._executionContextChanged, this);
-
-    this._messagesElement.addEventListener("mousedown", this._updateStickToBottomOnMouseDown.bind(this), false);
-    this._messagesElement.addEventListener("mouseup", this._updateStickToBottomOnMouseUp.bind(this), false);
-    this._messagesElement.addEventListener("mouseleave", this._updateStickToBottomOnMouseUp.bind(this), false);
-    this._messagesElement.addEventListener("wheel", this._updateStickToBottomOnWheel.bind(this), false);
 }
 
 WebInspector.ConsoleView.persistedHistorySize = 300;
@@ -350,7 +344,7 @@
 
     restoreScrollPositions: function()
     {
-        if (this._viewport.stickToBottom())
+        if (this._viewport.scrolledToBottom())
             this._immediatelyScrollToBottom();
         else
             WebInspector.Widget.prototype.restoreScrollPositions.call(this);
@@ -360,7 +354,7 @@
     {
         this._scheduleViewportRefresh();
         this._hidePromptSuggestBox();
-        if (this._viewport.stickToBottom())
+        if (this._viewport.scrolledToBottom())
             this._immediatelyScrollToBottom();
         for (var i = 0; i < this._visibleViewMessages.length; ++i)
             this._visibleViewMessages[i].onResize();
@@ -380,10 +374,6 @@
          */
         function invalidateViewport()
         {
-            if (this._muteViewportUpdates) {
-                this._maybeDirtyWhileMuted = true;
-                return Promise.resolve();
-            }
             if (this._needsFullUpdate) {
                 this._updateMessageList();
                 delete this._needsFullUpdate;
@@ -392,28 +382,12 @@
             }
             return Promise.resolve();
         }
-        if (this._muteViewportUpdates) {
-            this._maybeDirtyWhileMuted = true;
-            this._scheduleViewportRefreshForTest(true);
-            return;
-        } else {
-            this._scheduleViewportRefreshForTest(false);
-        }
         this._viewportThrottler.schedule(invalidateViewport.bind(this));
     },
 
-    /**
-     * @param {boolean} muted
-     */
-    _scheduleViewportRefreshForTest: function(muted)
-    {
-        // This functions is sniffed in tests.
-    },
-
     _immediatelyScrollToBottom: function()
     {
         // This will scroll viewport and trigger its refresh.
-        this._viewport.setStickToBottom(true);
         this._promptElement.scrollIntoView(true);
     },
 
@@ -770,7 +744,6 @@
 
     _promptKeyDown: function(event)
     {
-        this._updateStickToBottomOnWheel();
         if (isEnterKey(event)) {
             this._enterKeyPressed(event);
             return;
@@ -1020,60 +993,6 @@
         highlightNode.classList.add(WebInspector.highlightedCurrentSearchResultClassName);
         this._viewport.scrollItemIntoView(matchRange.messageIndex);
         highlightNode.scrollIntoViewIfNeeded();
-    },
-
-    _updateStickToBottomOnMouseDown: function()
-    {
-        this._muteViewportUpdates = true;
-        this._viewport.setStickToBottom(false);
-        if (this._waitForScrollTimeout) {
-            clearTimeout(this._waitForScrollTimeout);
-            delete this._waitForScrollTimeout;
-        }
-    },
-
-    _updateStickToBottomOnMouseUp: function()
-    {
-        if (!this._muteViewportUpdates)
-            return;
-
-        // Delay querying isScrolledToBottom to give time for smooth scroll
-        // events to arrive. The value for the longest timeout duration is
-        // retrieved from crbug.com/575409.
-        this._waitForScrollTimeout = setTimeout(updateViewportState.bind(this), 200);
-
-        /**
-         * @this {!WebInspector.ConsoleView}
-         */
-        function updateViewportState()
-        {
-            this._muteViewportUpdates = false;
-            this._viewport.setStickToBottom(this._messagesElement.isScrolledToBottom());
-            if (this._maybeDirtyWhileMuted) {
-                this._scheduleViewportRefresh();
-                delete this._maybeDirtyWhileMuted;
-            }
-            delete this._waitForScrollTimeout;
-            this._updateViewportStickinessForTest();
-        }
-    },
-
-    _updateViewportStickinessForTest: function()
-    {
-        // This method is sniffed in tests.
-    },
-
-    _updateStickToBottomOnWheel: function()
-    {
-        this._updateStickToBottomOnMouseDown();
-        this._updateStickToBottomOnMouseUp();
-    },
-
-    _promptInput: function(event)
-    {
-        // Scroll to the bottom, except when the prompt is the only visible item.
-        if (this.itemCount() !== 0 && this._viewport.firstVisibleIndex() !== this.itemCount())
-            this._immediatelyScrollToBottom();
     },
 
     __proto__: WebInspector.VBox.prototype