Comment # 24 on bug 1205585 from Fabian Vogt

(In reply to Fabian Vogt from comment #23)
> My guess is that with Xvnc there's a different selection of X11 visuals
> available and the installer selects one which does not quite work with the
> font rendering method. It might be missing alpha for instance or somehow
> blend it incorrectly.

Correct. Xvnc is started with -depth 16, so the default visual is RGB565. I can
reproduce the issue locally by running "kate -stylesheet
/usr/share/YaST2/theme/current/wizard/installation.qss" connected to Xvnc
-depth 16. It works with a 32bit visual, e.g. -visual 0x400.