rem: ClearThreadPane(); 
add: msgWindow.openFolder = null; ClearThreadPane(); 
context: function FolderPaneSelectionChange(){  var tree = GetFolderTree();  if(tree)  {    var selArray = tree.selectedItems;    if ( selArray && (selArray.length == 1) )    {      ChangeFolderByDOMNode(selArray[0]);    }    else    {      ClearThreadPane();    }  }  if (!gAccountCentralLoaded)    ClearMessagePane();  if (gDisplayStartupPage)  {    loadStartPage();    gDisplayStartupPage = false;  }}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/1e0e99191d9d4f4f04fb4061b0ba91f347b8986f/commandglue.js/buggy/mailnews/base/resources/content/commandglue.js