[Devtools] Fix network grouping experiment

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 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
@@ skipping 825 matching lines @@
         continue;
       var isFilteredOut = !this._applyFilter(node);
       if (isFilteredOut && node === this._hoveredNode)
         this._setHoveredNode(null);
 
       if (!isFilteredOut)
         nodesToRefresh.push(node);
       var request = node.request();
       this._timeCalculator.updateBoundaries(request);
       this._durationCalculator.updateBoundaries(request);
-      if (node[Network.NetworkLogView._isFilteredOutSymbol] === isFilteredOut)
+      var newParent = this._parentNodeForInsert(node);
+      if (node[Network.NetworkLogView._isFilteredOutSymbol] === isFilteredOut && node.parent === newParent)
         continue;
       node[Network.NetworkLogView._isFilteredOutSymbol] = isFilteredOut;
-      var newParent = this._parentNodeForInsert(node);
       var removeFromParent = node.parent && (isFilteredOut || node.parent !== newParent);
       if (removeFromParent) {
         var parent = node.parent;
         parent.removeChild(node);
         while (parent && !parent.hasChildren() && parent.dataGrid && parent.dataGrid.rootNode() !== parent) {
           var grandparent = parent.parent;
           grandparent.removeChild(parent);
           parent = grandparent;
         }
       }
@@ skipping 977 matching lines @@
    * @return {?*}
    */
   groupForRequest: function(request) {},
 
   /**
    * @param {!*} key
    * @return {string}
    */
   groupName: function(key) {}
 };