[Bug 11582] Macromedia Flash 5 Trial hangs when you click "Try" (ShowWindow operations should avoid potentially blocking inter-thread SendMessage if show command is no-op)

http://bugs.winehq.org/show_bug.cgi?id=11582

--- Comment #14 from Dmitry Timoshkov  ---
(In reply to comment #13)
> Created attachment 47211 [details]
> Return immediately from ShowWindow if hiding a previously hidden Window
>
> I believe the attachment address AF's analysis.  The program goes a bit
> farther, but the second thread gets caught in a Debug loop.
>
> Should the patch be submitted to wine-patches?

Looks reasonable, show_window() implementation does the same check.
Just a nitpick: remove extraneous braces around WS_VISIBLE :)