rem: if (target.parentNode == this.mOutliner) { 
add: if (target.parentNode == this.mTree) { 
context:   onDragGesture: function(aEvent)  {    var target = aEvent.target;    if (target.parentNode == this.mOutliner) {      var column = target.getAttribute("label");      var idx = this.getColumnIndexFromHeader(target);      if (idx == -1) return;      this.mColumnDragging = idx;      DNDUtils.invokeSession(target, ["OutlinerBuilder/column-remove"], [column]);    }  },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/d38a0937d9c93a0a9d913e2ac781e4328bb8cc73/inTreeBuilder.js/buggy/extensions/inspector/resources/content/jsutil/xul/inTreeBuilder.js