rem: return(retVal); 
context: function DragOverTree(event){    if (event.target.localName != "treecell" &&        event.target.localName != "treeitem")        return false;	var validFlavor = false;	var dragSession = null;	var retVal = true;	var dragService = GetDragService();	if ( !dragService )	return(false);	dragSession = dragService.getCurrentSession();	if ( !dragSession )	return(false);	if ( dragSession.isDataFlavorSupported("text/nsmessage") )	validFlavor = true;	//XXX other flavors here...	// touch the attribute on the rowgroup to trigger the repaint with the drop feedback.	if ( validFlavor )	{		//XXX this is really slow and likes to refresh N times per second.		var rowGroup = event.target.parentNode.parentNode;		rowGroup.setAttribute ( "dd-triggerrepaint", 0 );		dragSession.canDrop = true;		// necessary??		retVal = false; // do not propagate message	}	return(retVal);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/99d416cc418f0ec4f197e6246174722c57435148/messengerdnd.js/clean/mailnews/base/resources/content/messengerdnd.js