rem: var threadOutliner = GetThreadOutliner(); 
add: var threadTree = GetThreadTree(); 
context: function BeginDragThreadPane(event){    debugDump("BeginDragThreadPane\n");    var threadOutliner = GetThreadOutliner();    var selectedMessages = GetSelectedMessages();    //A message can be dragged from one window and dropped on another window    //therefore setNextMessageAfterDelete() here     //no major disadvantage even if it is a copy operation    SetNextMessageAfterDelete();    return BeginDragOutliner(event, threadOutliner, selectedMessages, "text/x-moz-message-or-folder");}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/d38a0937d9c93a0a9d913e2ac781e4328bb8cc73/messengerdnd.js/clean/mailnews/base/resources/content/messengerdnd.js