Handle the case when an active MDI child is being hidden

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at baikal.ru> writes:

> Hello,
>
> with my last patch I introduced a regression with frame menu handling
> when last maximized MDI child gets destroyed. Here is a better fix for
> that problem.
>
> Changelog:
>     Dmitry Timoshkov <dmitry at codeweavers.com>
>     Handle the case when an active MDI child is being hidden.

This is causing test failures here:

msg.c:1591: Test failed: wrong focus window 0x90028
msg.c:1616: Test failed: wrong focus window 0x90028
msg.c:1622: Test failed: wrong active MDI child (nil)
msg.c:1672: Test failed: wrong focus window 0x60026
msg.c:1678: Test failed: wrong focus window 0x60026
msg.c:1684: Test failed: wrong focus window 0x60026
msg.c:1746: Test failed: wrong focus window 0x90028
msg.c:1799: Test failed: wrong focus window 0x90028

-- 
Alexandre Julliard
julliard at winehq.org