Comment # 14 on bug 1123424 from Stefan Hundhammer

I just checked: It's the exact same in a reasonably recent Tumbleweed (tested
with openSUSE-Tumbleweed-DVD-x86_64-Snapshot20190224-Media.iso).

Test procedure:

- Install with a GNOME desktop
- Install any pure Qt application (used QDirStat here)
- In the GNOME desktop, open the "Tweaks" application
- In "Tweaks", switch to the "Fonts" page and change the "Scaling Factor"
- Start the Qt application (QDirStat or whatever)
- Check if the UI is rendered normally or with that tiny font

scaling factor multiple of 0.25 -> works
any other number (1.26, 1.01)   -> fail