rem: if (!aDeletedItem instanceof Components.interfaces.calIEvent || 
add: if (!(aDeletedItem instanceof Components.interfaces.calIEvent) || 
context:     onDeleteItem: function(aDeletedItem) {        if (!aDeletedItem instanceof Components.interfaces.calIEvent ||            this.mInBatch) {            return;        }        this.removeItemFromTree(aDeletedItem);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/86b3e374c6328fe31a47bc56e9aa8ca132420ecc/unifinder.js/buggy/calendar/resources/content/unifinder.js