https://bugs.kde.org/show_bug.cgi?id=462389

            Bug ID: 462389
           Summary: Legacy Applications: Apply scaling themselves: Scaling
                    changes depending on 2nd screen enabled or not
    Classification: Plasma
           Product: kwin
           Version: 5.26.3
          Platform: OpenSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: pos...@posteo.eu
  Target Milestone: ---

SUMMARY

I have enabled Legacy Applications: Apply scaling themselves and adjusted the
individual scaling of applications via environmental variables (GDK_SCALE=2.0,
etc.) in a way, that it looks fine on the primary screen.
The primary screen scales with 200%. 

If, however, the 2nd screen is enabled, which scales with 125%, it may happen,
that the legacy X11 applications spontaneously changes its scaling from 2.0 to
1.0. 
In this case I need to change the env variable and restart the application.
Doing this every now and then is rather annoying.

(Or vice versa, adjusted for multi-screen usage and scales with 1.0 when 2nd
screen is detached.)

Would it be possible and make sense to introduce an option to always consider
the scaling of the primary screen only, so that scaling doesn't change and need
to be corrected when screens are attached/detached?

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20221126
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7
Kernel Version: 6.0.8-1-default (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 580 Series

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