Created attachment 145493 [details] KCM windows put together to show difference Header Title Text visibly out of alignment in the Font Management KCM. STEPS TO REPRODUCE 1. Open System Settings; 2. Go to Appearance > Font Management; 3. Go to any other KCM in Appearance. OBSERVED RESULT Title text on Font Management is clearly vertically misaligned when compared to any of the other KCM in the Appearance category. EXPECTED RESULT Title text should be equally aligned as the other KCM. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux (available in About System) KDE Plasma Version: 5.23.5 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION Text alignment only checked in the Appearance KCMs whilst using X11 session.
Yeah, the Font Management KCM is written with QtWidgets, and System Settings injects a custom header for those KCMs, whereas QtQuick KCMs have standard headers. Making the custom header be pixel-for-pixel identical with the standard ones is a neverending nightmare that will never really go away until we kill off all the QtWidgets KCMs and only have QtQuick KCMs, at which point we can delete the entire systemsettings shell app codebase and display our KCMs only in the plasma-settings app which can only load QtQuick KCMs and is currently only used on Plasma Mobile. We can put a day or two of effort into making it more desktop-friendly and solve approximately five trillion bugs by killing off System Settings.
This is as fixed as we can fix it, as of Plasma 5.27.