Qt flatpak apps don't honor system font scaling
If I set system's font scaling via Gnome's tweak-tool, it also applies correctly to non-flatpak KDE/Qt apps, but Qt apps from Flathub (tested with KeePassXC and VLC) ignore the system font size and display a small font instead. GTK apps installed via flatpak work fine. I have reproduced this with CentOS 7 as well as Fedora 30.
This is important because font scaling is important for visually impaired users as well as those with a high DPI display.
Edited by Iiro Laiho