[Pkg-utopia-maintainers] Bug#835595: [flatpak] Impossible to run the app version from debian reposetory after

[Quabla]

To sum up:

1. Flatpak adds itself to XDG_DATA_DIRS (via /etc/profile.d/flatpak.sh) 
on Debian. Flatpak installations have precedence as default.
2. Currently, based on .desktop files, there is not even a sane way to 
support different versions in desktop shells. Gnome-shell is currently 
not planning to support it.

What remains would be to have an option to configure the flatpak 
precedence in a nice and clean way.