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