TimelinePanel: do not collapse record when user changes panel.

Source/devtools/front_end/TimelineView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 472 matching lines @@
     },
 
     /**
      * @return {!Array.<!Element>}
      */
     elementsToRestoreScrollPositionsFor: function()
     {
         return [this._containerElement];
     },
 
+    refreshRecords: function()
+    {
+        this._repopulateRecords();
+        this._updateSelectionDetails();
+    },
+
     wasShown: function()
     {
         WebInspector.View.prototype.wasShown.call(this);
 
-        this._repopulateRecords();
-        this._updateSelectionDetails();
-
         if (!WebInspector.TimelinePanel._categoryStylesInitialized) {
             WebInspector.TimelinePanel._categoryStylesInitialized = true;
             this._injectCategoryStyles();
         }
         this._onViewportResize();
         this._refresh();
     },
 
     willHide: function()
     {
@@ skipping 1229 matching lines @@
 
     /**
      * @param {!WebInspector.TimelinePresentationModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return record.lastChildEndTime >= this._windowStartTime && record.startTime <= this._windowEndTime;
     }
 }