Comment # 6 on bug 1123424 from Stefan Hundhammer

I just did a fresh Leap 15.0 installation in a QEMU VM to test this.

AFAICS that release does not have SVG icons yet for the YaST modules; it is
limited to a small set of pre-rendered PNG icons in those sizes below
/usr/share/YaST2/theme/icons:

  22x22/
  32x32/
  48x48/
  64x64/
 256x256/

I can confirm that strange things happen when trying to increase the desktop
scaling factor from 1.25 to 1.26, but in my case the content (both the icons
and the texts) completely disappear.

The YaST control center doesn't do anything special here; it just uses Qt
defaults for both font and icon sizes.

I am pretty sure that other Qt programs must have the same kind of problem in
that scenario; this must be somewhere deep within Qt, very likely in the layer
that implements the desktop settings that Qt (starting with Qt 5.x) now takes
from its desktop.