rem: return (gTransactionMgr.numberOfRedoItems > 0); 
add: return getTransactionMgr().canRedo(); 
context: function canRedo() {    return (gTransactionMgr.numberOfRedoItems > 0);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/fb400900a189649d7ad223b693edbb378dad6f41/calendar-item-editing.js/buggy/calendar/base/content/calendar-item-editing.js