Created attachment 157017 [details] Dark theme SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** Application's UI is visually broken on GNOME in both light and dark themes. STEPS TO REPRODUCE 1. Install from Flathub 2. Run 3. OBSERVED RESULT Broken UI EXPECTED RESULT The same UI as in KDE Plasma
Created attachment 157018 [details] Light theme
Yeah... this will happen with pretty much any QML app. What you are seeing is the "Default" style, which is really really basic. I've added some code to fall back to a better style, but I think https://github.com/FedoraQt/QGnomePlatform/pull/130 is the more proper fix.
The PR you linked is more about Fedora's RPM I believe. But this problem is in the Flatpak build. A good fix would be to put the proper QML theme inside the KDE's Flatpak runtime.
The flatpak runtime also ships QGnomePlatform, so this is in fact not RPM specific.
AudioTube crashes on launch on my system, but other KDE apps no longer exhibit missing icons on my system using the Flatpak package. Can you still reproduce this?