DevTools: Remember the last focused widget.

third_party/WebKit/Source/devtools/front_end/sources/NavigatorView.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * 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 139 matching lines @@
     contextMenu.appendItem(searchLabel, searchPath);
 }
 
 WebInspector.NavigatorView.prototype = {
     /**
      * @override
      */
     focus: function()
     {
         this._scriptsTree.focus();
+        this.wasFocused();
     },
 
     /**
      * @param {!WebInspector.Workspace} workspace
      */
     _resetWorkspace: function(workspace)
     {
         this._workspace = workspace;
         this._workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeAdded, this._uiSourceCodeAdded, this);
         this._workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeRemoved, this._uiSourceCodeRemoved, this);
@@ skipping 1399 matching lines @@
     {
         if (this._treeElement)
             return this._treeElement;
         this._treeElement = new WebInspector.NavigatorFolderTreeElement(this._navigatorView, this._type, this._title, this._hoverCallback);
         this._treeElement.setNode(this);
         return this._treeElement;
     },
 
     __proto__: WebInspector.NavigatorTreeNode.prototype
 }