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portal-impl: Use fallback portals for Settings as well #1358

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portal-impl: Use fallback portals for Settings as well #1358

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Commits on Oct 5, 2024

  1. portal-impl: Use fallback portals for Settings as well 

    Since 1.18.2, we have a hardcoded fallback to xdg-desktop-portal-gtk as
a last resort if no other portal is defined by a configuration file.
This fallback mechanism, however, isn't implemented for the
org.freedesktop.impl.portal.Settings interface.

The consequence is that everything seems to work just fine, but user
preferences like color scheme are ignored in applications that use the
portal API to retrieve them (not just flatpak apps, also libadwaita
apps). That comes as a surprise to users; and since the portal stuff
otherwise works fine, it's not entirely straightforward to figure out
that configuring portal.conf would fix it.

I believe that if find_portal_implementation implements fallbacks, so
should find_all_portal_implementations, for consistency and to avoid
surprises.

The fallback logic this commit implements closely resembles the logic in
find_portal_implementation: we don't look for fallbacks if there is a
portal configured in portals.conf (or if portals.conf explicitly says
there should be none), and we only use the x-d-p-gtk as a last resort if
we haven't found any impl(s) using the legacy UseIn key.

(The above should be a self-contained description but there's some
additional thoughts at
flatpak#1199 (comment))

Fixes: d18c563 ("portal-impl: Hard-code x-d-p-gtk as a last-resort fallback")
Related: flatpak#1102
    @liskin
    liskin committed Oct 5, 2024
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  2. portal-impl: Cosmetics

    @liskin
    liskin committed Oct 5, 2024
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