[Bug 53204] New: shell32:autocomplete - test_custom_source() sometimes gets DropDown failures on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53204

Bug ID: 53204
           Summary: shell32:autocomplete - test_custom_source() sometimes
                    gets DropDown failures on Windows
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: shell32
          Assignee: [e-mail]
          Reporter: [e-mail]

shell32:autocomplete - test_custom_source() sometimes gets DropDown failures on
Windows:

autocomplete.c:778: Test failed: AutoComplete DropDown should be visible
autocomplete.c:788: Test failed: AutoComplete DropDown should be hidden

https://test.winehq.org/data/patterns.html#shell32:autocomplete

The second failure is not always present.
They only happen on Windows 10.