[Bug 54497] New: riched20:editor - The window is sometimes visible in test_eventMask() on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54497

Bug ID: 54497
           Summary: riched20:editor - The window is sometimes visible in
                    test_eventMask() on Windows
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: richedit
          Assignee: [e-mail]
          Reporter: [e-mail]

riched20:editor - The window is sometimes visible in test_eventMask() on
Windows:

editor.c:6641: Test failed: Window shouldn't be visible.

See https://test.winehq.org/data/patterns.html#riched20:editor

This failure can happen on any Windows version from Windows 7 to 10 21H1.
There are only 5 known instances over the past 6 months which makes it pretty
rare:
* 2022-10-18 on w10pro64v2004 32-bit
* 2022-11-08 on w1064v2009 64-bit
* 2022-11-09 on w7u-2qxl (32-bit)
* 2022-12-22_20 w10pro64-ar 64-bit
* 2023-02-15 on w7u_adm (32-bit) for MR2212