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Tue Aug 30 17:20:58 CDT 2005

< In a window currently covered by another window in the same thread 
< (the message will be sent to underlying windows in the same thread
< until one of them returns a code that is not HTTRANSPARENT).

Note "window in the same thread". So it seems that you (Wine) shouldn't
pass down mouse messages to thread 1 in your example.

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