https://bugs.kde.org/show_bug.cgi?id=375686

            Bug ID: 375686
           Summary: Black square in top-left corner
           Product: plasmashell
           Version: 5.8.4
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: XembedSNIProxy
          Assignee: plasma-b...@kde.org
          Reporter: p...@ralfj.de
  Target Milestone: 1.0

Created attachment 103690
  --> https://bugs.kde.org/attachment.cgi?id=103690&action=edit
Screenshot demonstrating the issue

When compositing is disabled, I can sometimes see a black square in the
top-left corner.  I believe this is related to xembed-sni-proxy because
clicking the black square behaves like clicking on one of the tray icons that
are managed by xembed-sni-proxy -- both for left-click and right-click.  The
square is not visible when compositing is enabled, but e.g. going to
full-screen in mpv disabled compositing and then I have this square on top of
the video.  Furthermore, *clicking* the area covered by the invisible square
still behaves the same when compositing is enabled (naturally, as compositing
does not affect input handling).

This is not 100% reproducible, I just restarted the application tied to the
square (Gajim) and the square did not come back.

I will attach a screenshot demonstrating the issue.

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