add: if (this.mBatchCount) { return; } 
context: function observer_onDeleteItem(item, rebuildFlag){    var occs = item.getOccurrencesBetween(this.agendaTreeView.today.start,                                          this.agendaTreeView.soon.end, {});    occs.forEach(this.agendaTreeView.deleteItem, this.agendaTreeView);    if (rebuildFlag != "no-rebuild")        this.agendaTreeView.rebuildAgendaView();};
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/c833b6618a501f5edb59311b9dc9a982ec63cf59/agenda-tree.js/buggy/calendar/lightning/content/agenda-tree.js