Do not allow flushing while already flushing the message queue. Added to help track bugs in ProgressDialog in editor.
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@ -271,6 +271,7 @@ void MessageQueue::flush() {
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//using reverse locking strategy
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_THREAD_SAFE_LOCK_
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ERR_FAIL_COND(flushing);
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flushing = true;
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while (read_pos < buffer_end) {
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