rem: calendar.modifyItem(event, null); 
add: calendar.modifyItem(event, originalEvent, null); 
context:     var onModifyEvent = function(event, calendar, originalEvent) {        // compare cal.uri because there may be multiple instances of        // calICalendar or uri for the same spec, and those instances are        // not ==.        if (!originalEvent.calendar ||             (originalEvent.calendar.uri.equals(calendar.uri)))            calendar.modifyItem(event, null);        else {            originalEvent.calendar.deleteItem(event, null);            calendar.addItem(event, null);        }    }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/f0c77cac48e7ce31af529637a1b48c03f4314901/calendar-item-editing.js/buggy/calendar/base/content/calendar-item-editing.js