The name of the trigger event the listener was activated under.
The EventListener descriptor to deactivate, as found via findEventListener or returned from activateListener.
The DomItem the listener is attached to.
The same DomItem, with this listener detached and marked inactive.
Deactivate a single listener: detach it from the element (if it was actually attached) and remove it from activeListeners, without disturbing any other listener sharing the same options bucket.