Hi,
This is a direct response to flatkill.org 2020.
I’ve heard a lot of misinformation about Flatpak spread by the community and by a website called flatkill.org. I took the time to write my own response with the help of Flatpak contributors and developers to debunk the claims of flatkill.org to stop the spread of false information.
Anki, Calibre, MuseScore are examples of Qt apps from FlatHub not using Breeze, I’m not aware of any way to fix this and FlatHub maintainers just reply “we stuck to whatever upstream does”.
Instead VLC is an example of Qt app from FlatHub that uses Breeze in Plasma.
Flatpak should have a way to detect the current session is Plasma, install KDE runtime or whatever is needed and makes all its Qt apps use whatever QtWidget theme the user set. Otherwise the Flatpak Qt apps (or at least FlatHub’s in case we come up with a Flatpak repo optimized for Plasma) would always be second-class citizens.