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combase: Use SendMessageW() in ClientRpcChannelBuffer_SendReceive() for STAs.

Zhiyi Zhang requested to merge zhiyi/wine:combase-fixes into master

An application has a thread 1 sending WM_DESTROY to windows in thread 2. When handling the message in thread 2, RevokeDragDrop() is called to release a COM object in thread 1. Then deadlock happens when using PostMessageW() because the DM_EXECUTERPC message will not be handled as thread 1 is still waiting for thread 2 to finish handling WM_DESTROY.

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