Use portals for file access on Linux

[DemiMarie]

Your use case

What would you like to do?

Use XDG portals for file access, as GTK and Qt do

Why would you like to do it?

Provides a native interface and unbreaks the Flatpak package.

How would you like to achieve it?

Use the XDG portal API.

Have you considered any alternatives?

None

Additional context

Portals are the modern way to access files on desktop Linux. They are supported by all major desktop environments.

[t3chguy]

This happens entirely upstream of us. We just use https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file which Electron translates to the most appropriate mechanism for the given OS & DE.