[turbolizer] Fix selection bugs and performance problems

tools/turbolizer/text-view.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 class TextView extends View {
   constructor(id, broker, patterns, allowSpanSelection) {
     super(id, broker);
     let view = this;
@@ skipping 150 matching lines @@
                                          function(a,b) { return a - b; });
     this.positionNodeMap.sort(function(a,b) {
       let result = view.nodePositionMap[a] - view.nodePositionMap[b];
       if (result != 0) return result;
       return a - b;
     });
   }
 
   selectLocations(locations, selected, makeVisible) {
     let view = this;
+    let s = new Set();
     for (let l of locations) {
       for (let i = 0; i < view.textListNode.children.length; ++i) {
         let child = view.textListNode.children[i];
         if (child.location != undefined && view.sameLocation(l, child.location)) {
-          view.selectCommon(child, selected, makeVisible);
+          s.add(child);
         }
       }
     }
+    view.selectCommon(s, selected, makeVisible);
   }
 
   getRanges(items) {
     let result = [];
     let lastObject = null;
     for (let i of items) {
       if (i.location) {
         let location = i.location;
         let start = -1;
         let end = -1;
@@ skipping 105 matching lines @@
       for (let i = 0; i < view.textListNode.children.length; ++i) {
         let child = view.textListNode.children[i];
         if (child.location && s(child.location)) {
           if (firstSelect) {
             makeContainerPosVisible(view.parentNode, child.offsetTop);
             firstSelect = false;
           }
           view.selection.select(child, selected);
         }
       }
-    } else if (s.length) {
+    } else if (typeof s[Symbol.iterator] === 'function') {
       for (let i of s) {
         if (firstSelect) {
           makeContainerPosVisible(view.parentNode, i.offsetTop);
           firstSelect = false;
         }
         view.selection.select(i, selected);
       }
     } else {
       if (firstSelect) {
         makeContainerPosVisible(view.parentNode, s.offsetTop);
-        firstSelect = false;
       }
       view.selection.select(s, selected);
     }
   }
 
   mouseDownLine(li, e) {
     let view = this;
     e.stopPropagation();
     if (!e.shiftKey) {
       view.selection.clear();
@@ skipping 35 matching lines @@
       let lineLocation = view.lineLocation(li);
       if (lineLocation != undefined) {
         li.location = lineLocation;
       }
       view.textListNode.appendChild(li);
     }
   }
 
   initializeContent(data, rememberedSelection) {
     let view = this;
+    view.selection.clear();
     view.clearText();
     view.processText(data);
     var fillerSize = document.documentElement.clientHeight -
         view.textListNode.clientHeight;
     if (fillerSize < 0) {
       fillerSize = 0;
     }
     view.fillerSvgElement.attr("height", fillerSize);
   }
 
@@ skipping 11 matching lines @@
   lineLocation(li) {
     let view = this;
     for (let i = 0; i < li.children.length; ++i) {
       let fragment = li.children[i];
       if (fragment.location != undefined && !view.allowSpanSelection) {
         return fragment.location;
       }
     }
   }
 }