add a method hasListener() in ListenerList object
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Key: PIVOT-611
URL: https://issues.apache.org/jira/browse/PIVOT-611
Project: Pivot
Issue Type: Improvement
Affects Versions: 1.5
Reporter: A.J.
Priority: Minor
there is no easy way to determine wether a listener has already been added to a
listener list (except by getting an iterator and traversing the list).
it would be convenient to have 'hasListener' method in the ListenerList class
that encapsulates this.
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