Merge 106560 - Web Inspector: [REGRESSION] Slow continuous DOM traversal with Up/Down keys

Source/WebCore/inspector/front-end/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 213 matching lines @@
 
         this._innerUpdate(refresh);
     },
 
     _executeRebuildUpdate: function(node, callback)
     {
         var resultStyles = {};
 
         function stylesCallback(matchedResult)
         {
-            if (matchedResult) {
+            if (matchedResult && this.node === node) {
                 resultStyles.matchedCSSRules = matchedResult.matchedCSSRules;
                 resultStyles.pseudoElements = matchedResult.pseudoElements;
                 resultStyles.inherited = matchedResult.inherited;
                 this._rebuildUpdate(node, resultStyles);
             }
             if (callback)
                 callback();
         }
 
         function inlineCallback(inlineStyle, styleAttributes)
@@ skipping 2109 matching lines @@
         var prefix = wordRange.toString().toLowerCase();
         if (!prefix && !force)
             return;
 
         var results = this._cssCompletions.startsWith(prefix);
         completionsReadyCallback(results);
     }
 }
 
 WebInspector.StylesSidebarPane.CSSPropertyPrompt.prototype.__proto__ = WebInspector.TextPrompt.prototype;