rem: return CanDropOnFolderOutliner(index); 
add: return CanDropOnFolderTree(index); 
context:     canDropOn: function(index)    {        return CanDropOnFolderOutliner(index);    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/d38a0937d9c93a0a9d913e2ac781e4328bb8cc73/msgMail3PaneWindow.js/clean/mailnews/base/resources/content/msgMail3PaneWindow.js