[PATCH 6/6] win32u: Move IsWindow implementation from user32.

[Marvin]

Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=109258

Your paranoid android.


=== debian11 (32 bit report) ===

user32:
win.c:11765: Test succeeded inside todo block: child should be topmost
win.c:11768: Test failed: grandchild should be topmost
win.c:11776: Test failed: child should NOT be topmost
win.c:11779: Test succeeded inside todo block: grandchild should NOT be topmost
win.c:11782: Test failed: 006F00A6: expected NOT topmost
win.c:11601: Test succeeded inside todo block: 5: hwnd 01420056 is still topmost

=== debian11 (64 bit WoW report) ===

user32:
win.c:11641: Test failed: 0000000000900114: expected prev 0000000000360098, got 0000000000000000
win.c:11655: Test failed: hwnd should NOT be topmost
win.c:11657: Test failed: 0000000000900114: expected NOT topmost
win.c:11601: Test failed: 1: hwnd 0000000000900114 is still topmost
win.c:11765: Test succeeded inside todo block: child should be topmost
win.c:11768: Test failed: grandchild should be topmost
win.c:11776: Test failed: child should NOT be topmost
win.c:11779: Test succeeded inside todo block: grandchild should NOT be topmost
win.c:11782: Test failed: 00000000011800DC: expected NOT topmost
win.c:11601: Test succeeded inside todo block: 5: hwnd 0000000000CA0040 is still topmost