Use Wallpaper Portal

[danirabbit]

Problem

We're currently relying on Contractor for setting the wallpaper, but we should be using the Wallpaper Portal

Proposal

Use the Wallpaper Portal: https://valadoc.org/libportal/Xdp.Portal.set_wallpaper.html

Prior Art (Optional)

No response

[zeebok]

It seems like this would involve updating Contractor to not report this action from the call to get_contracts_for_files() or specifically looking for the wallpaper option and replacing it with the libportal version. Given that we really want to see a rewrite maybe the latter option is better to triage this?

[danirabbit]

We're no longer shipping the set wallpaper contract with desktop settings, so this just needs a branch like elementary/files#2432