https://bugs.kde.org/show_bug.cgi?id=492918

--- Comment #1 from infinality <infinal...@infinality.net> ---
Additional notes:

- This plasma/qt issue is not specific to wayland.  I was able to reproduce it
on a Plasma (X11) session when scaled at 150% and 200% too.  It seems to
originate in high DPI code rather than wayland or x11 specific code (although
perhaps the same error is duplicated in both places).

- Changing QT_SCALE_FACTOR_ROUNDING_POLICY does cause rendering differences,
yet the font is still not hinted properly in any of the 5 cases.  "Passthrough"
is most natural looking.

- Chrome / chromium-based apps and wine are not impacted.

- GTK applications suffer from a similar (but certainly different in origin)
hinting issue in wayland (at least) that is worked around by setting
GDK_BACKEND=x11.  When unset, the font shapes are bad, but are different than
this plasma/qt issue.

- Firefox and thunderbird also suffer from apparently the same issue as GTK
applications (the shapes are bad in an identical way), and it is worked around
by setting MOZ_ENABLE_WAYLAND=0.

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