https://bugs.kde.org/show_bug.cgi?id=499289

--- Comment #5 from Alex J Green <[email protected]> ---
> Indeed, there are several "old" KDE applications (examples: KolourPaint,
> KPatience) whose rendering seem to be broken as well with similar symptoms.
> Maybe the issue is not related to font rendering itself, but a more general
> bitmap scaling issue when fractional scaling is enabled.

The problem has wider surface, than just "old" KDE applications.

If for example I open in Firefox
https://fonts.google.com/noto/specimen/Noto+Sans and set background to black
(there is a theme button on the page) and change font (there is a dropdown on
that page) from 48px to 20px, then fonts become colored like a rainbow. This is
only observed under Wayland session with non integer scale. Slowly scroll page
up and down -- and characters change their shape.

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