rem: this.mOperationListener); 
add: true, this.mOperationListener); 
context:     scheduleInvitationsUpdate:    function(firstDelay, repeatDelay, operationListener) {        if (this.mTimer) {            this.mTimer.cancel();        } else {            this.mTimer =                 Components.classes["@mozilla.org/timer;1"]                          .createInstance(Components.interfaces.nsITimer);        }        var callback = {            mInvitationsManager: this,            mRepeatDelay: repeatDelay,            mOperationListener: operationListener,            notify: function(timer) {                if (timer.delay != this.mRepeatDelay) {                    timer.delay = this.mRepeatDelay;                }                this.mInvitationsManager.getInvitations(                    this.mOperationListener);            }        };        this.mTimer.initWithCallback(callback, firstDelay,            this.mTimer.TYPE_REPEATING_SLACK);    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/1e3b01ccadd78ef0403300ec6b58d5d313065cf2/calendar-invitations-manager.js/clean/calendar/prototypes/wcap/calendar-invitations-manager.js