[PATCH 3/7] win32u: Move WM_WINDOWPOSCHANGED implementation from user32.

[Francois Gouget]

On Mon, 20 Jun 2022, Marvin wrote:
[...]
> === debian11 (32 bit Chinese:China report) ===
> 
> user32:
> win.c:11787: Test failed: 011D00CE: expected NOT topmost
> win.c:11606: Test succeeded inside todo block: 5: hwnd 00C00042 is still topmost

This is a preexisting pair of failures but the window handles prevent 
them from being recognized as such. It's actually part of a group of 7 
failures:
https://bugs.winehq.org/show_bug.cgi?id=53206

I also added it to the TestBot's list of known failures:
https://testbot.winehq.org/FailureDetails.pl?Key=139

-- 
Francois Gouget <fgouget at codeweavers.com>