[systemsettings] [Bug 405091] New: Subpixel rendering gets disabled when changing fonts

[Filip F.]

https://bugs.kde.org/show_bug.cgi?id=405091

            Bug ID: 405091
           Summary: Subpixel rendering gets disabled when changing fonts
           Product: systemsettings
           Version: 5.15.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: kcm_fonts
          Assignee: unassigned-bugs at kde.org
          Reporter: tyx027 at gmail.com
                CC: unassigned-bugs at kde.org
  Target Milestone: ---

SUMMARY
After updating to Plasma 5.15 subpixel rendering gets disabled every time when
changing fonts.

STEPS TO REPRODUCE
1. Change the system fonts -> the font previews lose subpixel rendering:
https://i.ibb.co/27BBDvm/Screenshot-20190304-220033.png
2. Hit apply -> System Settings as a whole loses subpixel rendering:
https://i.ibb.co/YTDhb6V/Screenshot-20190304-220100.png
3. Fire up System Settings again to see what it's supposed to look like
(subpixel rendering works):
https://i.ibb.co/cLYxxTf/Screenshot-20190304-220116.png

OBSERVED RESULT
Subpixel rendering does not work, first for the previews and then for the whole
System Settings when the change is applied.

EXPECTED RESULT
Subpixel rendering always works, like before 5.15.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.15.2
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.1

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