[Bug 54655] New: user32:msg - test_InSendMessage() sometimes gets unexpected flags on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54655

Bug ID: 54655
           Summary: user32:msg - test_InSendMessage() sometimes gets
                    unexpected flags 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_InSendMessage() sometimes gets unexpected flags on Windows:

msg.c:11738: Tests skipped: cannot set global hook
msg.c:19232: Failed sequence SendMessage from other thread 1:
msg.c:19232:   0: expected: msg 0402 - actual: MsgCheckProc: 00000000008B03E8
0402 wp 00000000 lp 00000000 (flags 19)
msg.c:19232:   1: expected: msg 0400 - actual: MsgCheckProc: 00000000008B03E8
0400 wp 00000000 lp 00000000 (flags 19)
msg.c:19252: Failed sequence SendMessage from other thread 3:
msg.c:19252:   0: expected: msg 0403 - actual: MsgCheckProc: 00000000008B03E8
0403 wp 00000000 lp 00000000 (flags 19)
msg.c:19252:   1: expected: msg 0401 - actual: MsgCheckProc: 00000000008B03E8
0401 wp 00000000 lp 00000000 (flags 19)
msg.c:19264: Failed sequence SendMessage from other thread 5:
msg.c:19292: Test failed: wrong flags a
msg.c:18660: Failed sequence SetFocus on a desktop window:

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

Where 0xa == ISMEX_NOTIFY | ISMEX_REPLIED
and the test expected 0x9 == ISMEX_SEND | ISMEX_REPLIED

This happens about once per month and impacts at least Windows 7 & 10,
regardless of locale:
* 2022-08-31 on w7u-pt-PT 32-bit
* 2022-08-31 on w7u 32-bit
* 2022-09-06 on w7u 32-bit
* 2022-09-15 on w7u-pt-PT 32-bit
* 2022-12-12 on w1064 32-bit
* 2023-02-20 on w10pro64-ar 64-bit
* 2023-03-02 on w7u-de 32-bit