https://bugs.kde.org/show_bug.cgi?id=395646

            Bug ID: 395646
           Summary: all mouse events breaking in VirtualBox
           Product: kwin
           Version: 5.13.1
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: majew...@gmx.net
  Target Milestone: ---

Created attachment 113457
  --> https://bugs.kde.org/attachment.cgi?id=113457&action=edit
qdbus org.kde.KWin /KWin org.kde.KWin.supportInformation

Since upgrading to Plasma 5.13.0 from 5.12.5, I've observed a regression on my
VirtualBox-based VM that runs on my work notebook (host is Windows 10). To
reproduce:

1. Start out with a Konsole window only. (That's usually all that I have open.)
At this point, everything works as far as I can see.

2. Open some other application. I tried Firefox and Filelight, both by running
them either from the Konsole or from KRunner.

3. The other application window opens. At this point, weird behavior ensues. 
Clicking into the other app causes Konsole to come back to the front. Clicking
on the panel does nothing. Using the mouse wheel (on either app) cycles between
the open windows, bringing them to the front in turns. Left clicks into the
Konsole window get ignored, but right clicks work and bring up its context
menu. 

4. Run "kwin_x11 --replace &" from the terminal. This is the only thing so far
that restores normal behavior for me, except that the app switcher in the panel
continues to not work (it reacts to hover events by highlighting the hovered
entry, but clicking on an entry does not do anything).

5. Change the active window with Alt-Tab. The weird behavior from step 3
re-emerges.

Note that this bug only affects mouse events. Keyboard events work fine in all
windows. Global shortcuts are not affected, either.

I checked the pacman.log to see if any other updates installed at the same time
may be causing the troubles, but found nothing that would be related to the
behavior observed.

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