[Bug 55426] New: user32:msg - test_swp_paint_region_on_show() sometimes fails on w7u

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55426

Bug ID: 55426
           Summary: user32:msg - test_swp_paint_region_on_show() sometimes
                    fails on w7u
           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_swp_paint_region_on_show() sometimes fails on w7u:

msg.c:9471: Test failed: GetRgnBox (on parent) returned 1
msg.c:9475: Test failed: parent update region: got (0,0)-(0,0), expected
(10,10)-(100,100)
msg.c:9508: Test failed: GetRgnBox (on parent) returned 1
msg.c:9512: Test failed: parent update region: got (0,0)-(0,0), expected
(20,20)-(120,120)

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

This first happened on 2023-07-13 and has happened about once a week since,
always on w7u. In particular it does not happen on w7pro64 but then that VM
only runs 64-bit tests so maybe this is just 32-bit-specific.

* 2023-07-13 win7_newtb-w7u-pt-PT_1
* 2023-07-14 win7_newtb-w7u-de
* 2023-07-19 win7_newtb-w7u-es
* 2023-08-01 win7_newtb-w7u-2qxl

See also bug 55425 which is similar but happens in
test_swp_paint_region_on_extend_zerosize() and started one month earlier.