Fix ConcurrentModificationException in GenericWebSocketClient. #12654
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Using a synchronized collection is not sufficient to prevent getting a ConcurrentModificationException due to the collection being modified on another thread. Instead, we need to make iteration and collection mutation be mutually exclusive, which this now does.
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Using a synchronized collection is not sufficient to prevent getting a ConcurrentModificationException due to the collection being modified on another thread. Instead, we need to make iteration and collection mutation be mutually exclusive, which this now does.
Fixes: #12652
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