[systemsettings] [Bug 409374] New: You can not enable font anti-aliasing with sub-pixel rendering because system settings will automatically put a check mark in the box to block anti-aliasing and make fonts unreadable and you can remove checkmark but gets placed back upon opening and close

[Josh Freeno]

https://bugs.kde.org/show_bug.cgi?id=409374

            Bug ID: 409374
           Summary: You can not enable font anti-aliasing with sub-pixel
                    rendering because system settings will automatically
                    put a check mark in the box to block anti-aliasing and
                    make fonts unreadable and you can remove checkmark but
                    gets placed back upon opening and close
           Product: systemsettings
           Version: 5.16.2
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: kcm_fonts
          Assignee: unassigned-bugs at kde.org
          Reporter: freefreeno81 at gmail.com
                CC: unassigned-bugs at kde.org
  Target Milestone: ---

Created attachment 121261
  --> https://bugs.kde.org/attachment.cgi?id=121261&action=edit
This is how it locks itself after you enable font anti-aliasing

SUMMARY
In fonts section of system settings for two days in Arch Linux after the latest
two batches of KDE updates I can not enable font anti-aliasing because when I
do and close out system settings and open it again and then open Dolphin at the
same time it automatically puts a check mark in the box for blocking
anti-aliasing so therefore it makes fonts completely unusable. This happened
and I thought I had a corrupt system so I spent the time to completely
reinstall Arch yesterday and it happened again as soon as I turned font
anti-aliasing on. I normally use fonts with enabled anti-aliasing and RGB
sub-pixel rendering with slight hinting for best looking fonts but the way it
is now I can't not enable any of that because when I do enable it then it
automatically puts a check mark in box for blocking anti-aliasing and sets it
from 1-99. You can go and remove check mark and it puts it back again upon
opening a couple apps. One last thing I am not for sure Dolphin has anything to
do it with I know if you open and close system settings with Dolphin open it
may talke a couple times but this happens for sure.

STEPS TO REPRODUCE
1. Enable font anti-aliasing with RGB sub-pixel rendering and slight hinting
2. Close settings and open Dolphin
3. Open System Settings at the same time as Dolphin and you may have to open
system setting and dolphin several times but the fonts will become unreadable.

OBSERVED RESULT
Unreadable fonts

EXPECTED RESULT
Readable fonts

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Yes
(available in About System)
KDE Plasma Version: 5.16.2
KDE Frameworks Version: 5.59
Qt Version: 5.13

ADDITIONAL INFORMATION
I am on Arch Linux stable and this happened on clean install after I thought my
system was corrupt I reinstalled. This is pretty serious bug.

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