Provide xdg-desktop-portal interfaces in gaming mode

[Pwnage Pineapple]

Non-steam games and applications installed via Flatpak often use xdg-desktop-portal interfaces to do things like open file selection windows, and xdg-desktop-portal currently isn't provided in gaming mode, which can break these applications. While I'm not sure exactly how the gaming mode interface is implemented, simply leveraging the KDE implementation would be a sufficient solution.

[dos]

As a workaround, you can set launch options to `XDG_CURRENT_DESKTOP=KDE %command%` to make it use the KDE portal implementations.

[Yeti]

+1

[Pwnage Pineapple]

Originally posted by dos:

As a workaround, you can set launch options to `XDG_CURRENT_DESKTOP=KDE %command%` to make it use the KDE portal implementations.

While non-steam apps don't support the %command% syntax, at least for flatpaks env variables can be set in the flatpak by passing it the `--env` parameter, so the concept still works.

[dos]

Originally posted by Pwnage Pineapple:

While non-steam apps don't support the %command% syntax

They do, but in some cases you're limited by reaper being part of the substituted command instead of your command being passed into reaper. In this particular case it should apply just fine though.