Removes the listener from the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget. The event type is one of the event constants defined in class SWT.
@param eventType the type of event to listen for
@param listener the listener which should no longer be notified when the event occurs
@exception IllegalArgumentException
ERROR_NULL_ARGUMENT - if the listener is null
@exception SWTException
ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
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