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Alexander Diewald authored
This allows listeners to deregister themselves. Otherwise, a ConcurrentModificationException will occut. This change ensures that the set of listeners remains the same while notifying all registered ones. Issue-Ref: 3993 Issue-Url: https://af3-developer.fortiss.org/issues/3993 Signed-off-by: Alexander Diewald <diewald@fortiss.org>
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