In various listeners I see in the code base, the listener is tied to a contribution that defines the events to be routed to the listener. Yet the listener code seems to confirm the event to be handled - e.g. if (!EVENTS_TO_HANDLE.contains(event.getName())) { return; } In my debugging I've not yet observed an instance where a listener receives an event that it did not request in its corresponding contribution - so I'm just curious as to this construct. Thanks.