https://bugs.kde.org/show_bug.cgi?id=445088

            Bug ID: 445088
           Summary: Dual monitor setup: Program window display gets mashed
                    up when small old monitor is configured left (aside
                    new higher dpi monitor)
           Product: kwin
           Version: 5.18.7
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: multi-screen
          Assignee: kwin-bugs-n...@kde.org
          Reporter: t...@arcor.de
  Target Milestone: ---

Created attachment 143288
  --> https://bugs.kde.org/attachment.cgi?id=143288&action=edit
Screenshot

SUMMARY
The program window display of some programs (VLC at video playback, Kontact,
LibreOffice) gets mashed up when small old monitor is configured left (aside
new higher dpi monitor). (Settings-Display and monitor). When the old small
monitor is configured right aside the new one, everything works fine.


STEPS TO REPRODUCE
1. Open Settings - Display and monitor
2. Move the box representing the old monitor to the left 
3. Start Kontact, VLC player (video playback) or LibreOffice

--> program window display will be mashed up. :(

4. Move the box representing the old monitor to the right (no restart required)
5. Start Kontact, VLC player or LibreOffice again

--> everything works fine :)

See screenshots.


Workaround:
a) Libre Office: remove libreoffice-qt5 and libreoffice-gtk2 package, install
libreoffice-gtk3 package instead (?!)
b) VLC: use custom skin ("avs 95 beta")

Hardware: 
Main display: Eizo 27" 2560 x 1440 (144ish-dpi)
2nd display: Acer 19" 1280x1024
Geforce GT 610

Software:
OpenSuse Leap 15.3
KDE 5.18 LTS
NVIDIA 390.144-lp153.31.1 graphics driver (closed source)
libqt* 5.12.7*
KDE Framework: 5.76

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