Document initially written by Vincent Batts, adapted to Slint by Didier Spaier

Flatpak is a framework for desktop applications on Linux. It allows to install
in Slint applications not available as regular packages, or of a more recent
version, or difficult to build for Slint.

CAVEATS
1. The applications installed via flatpak can only be managed by flatpak, not
by the usuall packages management tools.
2. The applications installed via flatpak, along with their dependencies, are
very huge (several hundreds of megabytes for the simpler ones), so you will
need a lot of space on diak to install them.
3. The security offered by flatpak is debatable. This at least is stated in:
https://ludocode.com/blog/flatpak-is-not-the-future

You can find many apps already available on https://flathub.org/

The flathub remote repository is included in Slint's configuration during
installation.

As a limited user, you will get a polkit prompt for root's
password. This is because the default location for establishing these
repos is in `/var/lib/flatpak` and requires admin privileges.

You can optionally add the flag `--user` to flatpak commands, and it
will instead manage the repos in `~/.local/share/flatpak`.

Apps that require pulse audio (like steam, skype, etc) need
PULSE_SERVER environment variable to be set. This is not set for most
shells in slackware by default. One way I (Vincent) found to set this is:

export $(xprop -root -notype PULSE_SERVER | tr -d ' ')

There are examples of flatpak runtimes and applications on their wiki:
https://github.com/flatpak/flatpak/wiki/Examples

They too have desktop launchers search by desktops like KDE and XFCE,
it will require a logout, as /etc/profile.d/flatpak.sh will need to
be sourced.