I have apps still running Qt4, like Clementine. KDE systemsettings font settings apply to Qt5 apps. I set Qt4-config font style and it gets written to TrollTech.conf. But after reboot, it gets overwritten and Qt4-config goes back to default Version-Release number of selected component (if applicable): 4.8.7 How reproducible: Steps to Reproduce: 1. Edit settings in qtconfig-qt4 2. Save and exit 3. Reboot Settings are overwritten back to default.
I think this file gets written by something, probably Plasma 5.