[Bug 42894] New: Black or overlapped display at the bottom of context menus when running two Wine apps

https://bugs.winehq.org/show_bug.cgi?id=42894

Bug ID: 42894
           Summary: Black or overlapped display at the bottom of context
                    menus when running two Wine apps
           Product: Wine
           Version: 2.4
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 58028
  --> https://bugs.winehq.org/attachment.cgi?id=58028
Ensure Excel overlaps foobar2000

I'm running Excel and foobar2000 with the windows partially or fully
overlapped, and when I open new dialogs in these applications, I often see a
black band at the bottom. Sometimes I see the context menu of the application
in the background when I right-click in the foreground application - e.g. right
clicking on a cell in Excel shows foobar2000's context menu.

The black band doesn't appear if the windows are "high enough" on the screen
(in the top half, roughly). The context menus overlapping is still a problem.

I don't recall having this problem until perhaps Feb 2017 so it might be a
regression, or maybe I wasn't using both apps at the same time.

Either way, it's quite a blatant bug, so apologies if my search hasn't found
previous reports of it.