Make UnitImageFactory synchronized. #12649
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It's already used from multiple threads, per triplea-game#12623, so making the methods that access internal collections synchronized to fix ConcurrentModificationException. This is using the lombok synchronized annotation which is better than the Java keyword since it keeps an internal lock object.
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It's already used from multiple threads, per #12623, so making the methods that access internal collections synchronized to fix ConcurrentModificationException.
This is using the lombok synchronized annotation which is better than the Java keyword since it keeps an internal lock object.
Fixes #12623
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