Created attachment 801232 [details]
Qt (incorrect)

After upgrading to Qt 5.12.2, in all native Qt applications, Cyrillic charters
(Arial 10) are not displayed correctly when smoothing with fullhint. (Compare 2
screenshots)
At the same time, this manifests itself only in native Qt applications, while
in KDE applications and GTK applications everything is fine, as before.
Latin fonts are displayed normally, as before.

Anti-aliasing are configured via systemsettings (Font:Arial 10, Use
anti-aliasing:Enabled, Hinting style:Full, Exclude range:off, Sub-pixel:off)

Changing settings via Yast2-fonts does not affect the display of fonts, even in
systemsettings set "Use anti-aliasing:System settings".

Test set of words where the defect is clearly visible. (the letters move along
the X axis)
�������������� �������� �������� �������������� �������������� ��������������