[Bug 51130] user32:win test_SetActiveWindow() has 2 failures on Vista to Windows 8.1

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51130

Rémi Bernon <rbernon at codeweavers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rbernon at codeweavers.com
      Fixed by SHA1|                            |ebe3cea01d127de612171b6276c
                   |                            |473a2b455266d
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Rémi Bernon <rbernon at codeweavers.com> ---
I think the problem was coming from SetActiveWindow(0) calls, which were done
on various occasion, trying to de-activate the active window. The problem is
that on older (< Win10), SetActiveWindow(0) succeeds but tries to give the
foreground to another applications (or requests it back on the second call),
possibly losing it.

I'm not completely sure if this was a bug or a feature, and I'm a bit surprised
that you could get the foreground back as easily (although I haven't tried what
an user action could change). But this has clearly been removed since Win10.
The call now returns 0 (which should be understood as a failure I guess,
although it doesn't change last error).

I added proper testing of this behavior, and removed the calls where they were
done as it's a bit unpredictable. I believe the failure should not happen
anymore after ebe3cea01d127de612171b6276c473a2b455266d (although there may
still be GetActiveWindow failures elsewhere for other reasons).

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