[kde] [Bug 426045] New: global scaling or dual-head display causes paint problems

[Wim Delvaux]

https://bugs.kde.org/show_bug.cgi?id=426045

            Bug ID: 426045
           Summary: global scaling or dual-head display causes paint
                    problems
           Product: kde
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: dualhead
          Assignee: unassigned-bugs at kde.org
          Reporter: wim.delvaux at adaptiveplanet.com
  Target Milestone: ---

Created attachment 131334
  --> https://bugs.kde.org/attachment.cgi?id=131334&action=edit
virtual box display problem

SUMMARY

I have a dual display setup with monitors of different resolution.
I have global scaling enabled and set to 175 %

when I start some applications like vlc, virtualbox, dragonplayer, kate the
content of the application is not drawn properly and the content of the window
(menus button etc) is unusable/unreactive.  Resizing the window does not
refresh the window (see ttached screenshot of virtualbox

now when I disable one screen OR set the global scaling to 100 % the paint
problems go away.

when I mess with the backend renderer the problem does not go away.

setting the scaling to 100% and using the fonts to scale is a workaround but it
does not increase the size of visual elements like scrollbars which remain
rather small.

KDE Frameworks 5.68.0
Qt 5.12.8 (built against 5.12.8)
The xcb windowing system

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