Use XDG Desktop Portal to autostart the flatpak Fixes #8668

[moriol42]

When using the KeePassXC flatpak, uses the Background XDG Desktop Portal to create a desktop file automatically in the right location instead of creating one directly in the wrong location. Fixes #8668

TODO:

• Checking if autostart was enable does not work, and that results in the app thinking autostart is disabled. When the settings are opened the checkbox "Automatically launch KeePassXC at system startup" is unticked and if they are applied without re-ticking the checkbox, the autostart will be disabled. This check was previously done by checking if the desktop file existed, but it does not make sense to do that if we don't create this file ourselves. Should the autostart status be saved in a config file elsewhere instead ?

An empty string is passed instead of the window id of the application since I don't know how to get this id.

Testing strategy

I built and tested the flatpak manually on Fedora 39 on Gnome and KDE, when the "Automatically launch KeePassXC at system startup" checkbox is ticked and the settings are applied, the portal creates the file ~/.config/autostart/org.keepassxc.KeePassXC.desktop:

[Desktop Entry]
Exec=flatpak run org.keepassxc.KeePassXC
Name=org.keepassxc.KeePassXC
Type=Application
X-Flatpak=org.keepassxc.KeePassXC

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[droidmonkey]

Neato!

[moriol42]

I updated my PR to check if the autostart request to the portal was successful and to store the autostart behavior in the config file under the key GUI_LaunchAtStartup. In my testing, the flatpak version now works as intended.