[Bug 55463] New: user32:msg - test_SetFocus() sometimes gets an unexpected WM_WINDOWPOSCHANGED on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55463

Bug ID: 55463
           Summary: user32:msg - test_SetFocus() sometimes gets an
                    unexpected WM_WINDOWPOSCHANGED on Windows
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]

user32:msg - test_SetFocus() sometimes gets an unexpected WM_WINDOWPOSCHANGED
on Windows:

msg.c:18822: Test failed: SetFocus on a child window: 5: the msg 0x001c was
expected, but got msg 0x0047 instead
msg.c:18822: Failed sequence SetFocus on a child window:
msg.c:18822:   0: expected: hook 0009 - actual: CBT: hook 9 (HCBT_SETFOCUS) wp
008f00e0 lp 00000000
msg.c:18822:   1: expected: hook 0005 - actual: CBT: hook 5 (HCBT_ACTIVATE) wp
008d00c4 lp 0034f5f8
msg.c:18822:   2: expected: winevent 0003 - actual: WEH: winevent
00000000008D00C4 00000003 00000000 00000000
msg.c:18822:   3: expected: msg 030f - actual: parent: 00000000008D00C4
WM_WINDOWPOSCHANGING wp 00000000 lp 0034f5e0 after 0000000000C600FA x 0 y 0 cx
0 cy 0 flags SWP_NOSIZE|SWP_NOMOVE (flags 1d)
msg.c:18822:   4: expected: msg 0046 - actual: parent: 00000000008D00C4
WM_WINDOWPOSCHANGING wp 00000000 lp 0034f5e0 after 0000000000C600FA x 0 y 0 cx
0 cy 0 flags SWP_NOSIZE|SWP_NOMOVE (flags 1d)
msg.c:18822:   5: expected: msg 001c - actual: parent: 00000000008D00C4
WM_WINDOWPOSCHANGED wp 00000000 lp 0034f5e0 after 0000000000C600FA x 0 y 0 cx
132 cy 38 flags
SWP_NOREDRAW|SWP_NOSIZE|SWP_NOMOVE|SWP_NOCLIENTSIZE|SWP_NOCLIENTMOVE (flags 1d)
msg.c:18822:   6: expected: msg 0086 - actual: parent: 00000000008D00C4 000d wp
00000208 lp 0034e6f0 (flags 1d)
msg.c:18822:   7: expected: msg 000d - actual: parent: 00000000008D00C4
WM_NCCALCSIZE: winpos->cx 132, winpos->cy 38 (flags 1d)
msg.c:18822:   8: expected: msg 000d - actual: parent: 00000000008D00C4
WM_NCCALCSIZE: winpos->cx 132, winpos->cy 38 (flags 1d)
msg.c:18822:   9: expected: msg 0006 - actual: parent: 00000000008D00C4
WM_NCCALCSIZE: winpos->cx 132, winpos->cy 38 (flags 1d)
msg.c:18822:   10: expected: hook 0009 - actual: WEH: winevent 00000000008D00C4
0000800b 00000000 00000000
msg.c:18822:   11: expected: winevent 8005 - actual: parent: 00000000008D00C4
001c wp 00000001 lp 00000220 (flags 1d)
msg.c:18822:   12: expected: msg 0007 - actual: parent: 00000000008D00C4 0086
wp 00000001 lp 00000000 (flags 1d)
msg.c:18822:   13: expected: msg 0008 - actual: parent: 00000000008D00C4 000d
wp 00000208 lp 0034e330 (flags 3d)
msg.c:18822:   14: expected: winevent 8005 - actual: parent: 00000000008D00C4
000d wp 00000208 lp 0034e380 (flags 3d)
msg.c:18822:   15: expected: msg 0007 - actual: parent: 00000000008D00C4 0006
wp 00000001 lp 00000000 (flags 1d)
msg.c:18822:   16: expected: nothing - actual: CBT: hook 9 (HCBT_SETFOCUS) wp
008d00c4 lp 00000000
msg.c:18822:   17: expected: nothing - actual: WEH: winevent 00000000008D00C4
00008005 fffffffffffffffc 00000000
msg.c:18822:   18: expected: nothing - actual: parent: 00000000008D00C4 0007 wp
00000000 lp 00000000 (flags 3d)
msg.c:18822:   19: expected: nothing - actual: parent: 00000000008D00C4 0008 wp
008f00e0 lp 00000000 (flags 1d)
msg.c:18822:   20: expected: nothing - actual: WEH: winevent 00000000008F00E0
00008005 fffffffffffffffc 00000000
msg.c:18822:   21: expected: nothing - actual: MsgCheckProc: 00000000008F00E0
0007 wp 008d00c4 lp 00000000 (flags 19)

See https://test.winehq.org/data/patterns.html#user32:msg

Where 0x001c == WM_ACTIVATEAPP
      0x0047 == WM_WINDOWPOSCHANGED

The first known instance happened on 2023-06-12 and this has happened about
once every other week since:
* 2023-06-12 win7_newtb-w7u-pt-PT
* 2023-06-14 win21H1_newtb-w10pro64-zh-CN-64
* 2023-07-06 win7_newtb-w7pro64-64
* 2023-07-13 win7_newtb-w7pro64-64_1
* 2023-08-10 win7_newtb-w7pro64-64