DevTools: [SSP] do not rebuild styles when sidebar pane is not showing

Source/devtools/front_end/elements/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 529 matching lines @@
             this.sections = {};
             if (userCallback)
                 userCallback();
             return null;
         }
         return this._node;
     },
 
     _styleSheetOrMediaQueryResultChanged: function()
     {
-        if (this._userOperation || this._isEditingStyle)
+        if (this._userOperation || this._isEditingStyle || !this.isShowing())

[vsevik, 2014/10/21 15:32:32]

Shouldn't we schedule an update when shown?

             return;
 
         this._rebuildUpdate();
     },
 
     _frameResized: function()
     {
         /**
          * @this {WebInspector.StylesSidebarPane}
          */
@@ skipping 3040 matching lines @@
         if (userEnteredText && (userEnteredText === userEnteredText.toUpperCase())) {
             for (var i = 0; i < results.length; ++i)
                 results[i] = results[i].toUpperCase();
         }
         var selectedIndex = this._cssCompletions.mostUsedOf(results);
         completionsReadyCallback(results, selectedIndex);
     },
 
     __proto__: WebInspector.TextPrompt.prototype
 }