rem: MsgOpenNewWindowForFolder(folderResource.Value); 
add: MsgOpenNewWindowForFolder(folderResource.Value, -1 /* key */); 
context: function FolderPaneDoubleClick(folderIndex, event){    var folderOutliner = GetFolderOutliner();    var folderResource = GetFolderResource(folderOutliner, folderIndex);    var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder);    var isServer = GetFolderAttribute(folderOutliner, folderResource, "IsServer");    if (isServer == "true")    {      if (!(folderOutliner.outlinerBoxObject.view.isContainerOpen(folderIndex)))      {        var server = msgFolder.server;        server.performExpand(msgWindow);      }    }    else     {      // Open a new msg window only if we are double clicking on       // folders or newsgroups.      MsgOpenNewWindowForFolder(folderResource.Value);      // double clicking should not toggle the open / close state of the      // folder.  this will happen if we don't prevent the event from      // bubbling to the default handler in outliner.xml      event.preventBubble();    }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/40dfed30ccb262ba82c984f2c5271a2e40ed0b97/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js