[kde] [Bug 503381] New: Plasma Shell and various QML/Qt Quick parts force RGB Subpixel Rendering for fonts, regardless of user-specified Subpixel Rendering setting

[cyangalaxy]

https://bugs.kde.org/show_bug.cgi?id=503381

            Bug ID: 503381
           Summary: Plasma Shell and various QML/Qt Quick parts force RGB
                    Subpixel Rendering for fonts, regardless of
                    user-specified Subpixel Rendering setting
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: skygalaxy19 at outlook.com
  Target Milestone: ---

Created attachment 180678
  --> https://bugs.kde.org/attachment.cgi?id=180678&action=edit
plasma-shell clock with forced RGB anti aliasing, resulting in colour-fringing

SUMMARY
At any UI-scale, except 100%!, various QML-written parts of KDE Plasma (shell,
System Settings, KDE apps & third party Qt Quick apps such as Fedora Media
Writer) exhibit forced RGB subpixel rendering, regardless of user-specified
Subpixel setting.

This is noticable on my BGR monitor as colour-fringing/chromatic abberation.

I've had this issue for at least over a year (Sorry for not creating an issue
earlier!). Reproducible on Fedora KDE, OpenSUSE TW, KDE Neon, Kubuntu. Plasma 5
doesn't have this issue.

STEPS TO REPRODUCE
1. Set UI-scale over 100%
2. Adjust Subpixel Rendering (e.g. Off or BGR) and reboot

OBSERVED RESULT
Observe the fact that RGB subpixel rendering is still applied to plasma-shell,
Discover & System Settings, etc. Causing colour-fringing/chromatic abberation
on Non-RGB monitors, such as BGR or OLED monitors.

EXPECTED RESULT
Qt Quick QML parts & apps also acknowledging the user-specified subpixel font
rendering setting.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora KDE, Kubuntu, KDE Neon, OpenSUSE TW
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.13
Qt Version: 6.9

ADDITIONAL INFORMATION
I use a 4K TV with BGR subpixels at 200%. Plasma Wayland with amdgpu driver (RX
6800)

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