[systemsettings] [Bug 416140] Sub-pixel font rendering shows "RGB" in the KCM, but is not actually applied

[Tony]

https://bugs.kde.org/show_bug.cgi?id=416140

--- Comment #39 from Tony <antonio.dimartino1 at gmail.com> ---
(In reply to nyanpasu64 from comment #38)
> Works in Plasma 5.22. Should this bug be closed, marked as duplicate of
> https://bugs.kde.org/show_bug.cgi?id=431197, or should that bug be marked as
> a duplicate of this?

This bug is somehow changed, but still persists in some conditions.
I've deleted the symbolic link that applies sub pixel rendering system wide.
I can see that user specific settings are present in
~/.config/fontconfig/fonts.conf and correctly applied:

tony at thinkpad-x230:~/.config/fontconfig$ cat fonts.conf | grep rgb
  <edit name="rgba" mode="assign">
   <const>rgb</const>

but NOT if file fonts.conf is missing.
If i delete fonts.conf and open fonts kcm, fonts.conf doesn't get created; kcm
still shows RGB set but it is *not* actually applied. Same situation after a
system reboot.
If i change some settings in fonts kcm, e.g. changing pixel rendering to none,
then fonts.conf is created and settings are correctly applied. Changing again
pixel rendering to rgb finally works.
So, conclusions are: on KDE Neon when file font.conf is missing, such as on a
freshly installed system, or if it is deleted, it should be recreated as soon
as possible, either by copying a skeleton system file, either by reflecting
system wide settings. In the last case, as rgb-subpixel rendering symlink is
missing, it should be set to none in kcm, to reflect system state.
For a new user, fonts kcm is in an inconsistent state, showing settings not
actually applied, so bug is still present.

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