Prevent .NET from randomly calling WndProc in RequestCompositionBatchCommitAsync #16804
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This method isn't reentrancy-friendly and that less-than-stellar way of dealing with COM objects in .NET is causing this to happen
This happens only on windows and only due to .NET locks being defective on STA threads, which is why it was hard to catch.
Should fix #15226
Thanks arnirichard for the stack trace which made it obvious