[Bug 48815] New: user32:win "unexpected 0x738 message" Windows 10 failures

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48815

            Bug ID: 48815
           Summary: user32:win "unexpected 0x738 message" Windows 10
                    failures
           Product: Wine
           Version: unspecified
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P2
         Component: user32
          Assignee: wine-bugs at winehq.org
          Reporter: fgouget at codeweavers.com

user32:win sometimes fails complaining about an unexpected 0x738 message:

win.c:3858: Test failed: message 0738 available

or

win.c:3852: Test failed: hwnd 00210500 message 0738

This second message includes the window handle which means it is "always new",
which can cause the TestBot to mistakenly attribute the failure to the patch
being tested. So I bumped the priority on this bug.

>From what I gathered the 0x738 message was introduced in Windows 10 1703 which
is why this failure only happens on our 1709+ test configurations (we don't
have 1703). Also nobody seems to know what this message is, only that it seems
to be related to windows belonging to the UserAdapterWindowClass:

https://forums.zimbra.org/viewtopic.php?t=63188
https://stackoverflow.com/questions/44395364/windows-creators-update-crashes-old-c-apps
https://github.com/otya128/winevdm/issues/114

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