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Currently the keyboard focus for the type of archive choice is always on
the first element.

This patch allows the focus to be on the currently selected item instead.

Fixes #1944

The flatpak build currently fails because of gexiv2 build failure, which is
a problem for our contributors and among others breaks our CI pipeline. The
potential fix is available already for a couple of days on
gexiv2!63 but not yet merged.
Let's temporarily pin the gexiv2 and exiv2 dependencies to the stable branches
to fix those issues.

Previously, when an image was selected as wallpaper it would
be copied unconditionally into the "Wallpapers" directory.
The image would be copied even if it was already in the "Wallpapers"
directory, resulting in copies of the image being created in
the same directory. This made it incovenient to potentially store
multiple backgrounds in the "Wallpapers" directory and switch
between them due to the fact that each wallpaper change would
result in the selected image being copied.

To avoid this, introduce a check, and only copy the image
if its parent is not the "Wallpapers" directory (as determined
by `g_file_equal()`).

For local files, `g_file_equal()` only compares the absolute
paths - at least at the moment. Comparing paths is not enough
to decide whether two entities are really the same in the presence
of e.g. bind mounts. However, such configuration is arguably a
very rare (if not non-existent). Nonetheless, users should not
experience any regressions even in that case since when
`g_file_equal()` returns a false negative, the old behaviour
applies.

Use `g_file_new_build_filename()` to create the file object
for the "Wallpapers" directory instead of the previously
used `g_file_new_for_path()` + `g_file_get_child()` in
`set_wallpaper_fallback()`.

Instead of manually calling `g_object_unref()` and `g_free()`,
use `g_auto{free,ptr}` to (mostly) do away with the need
of manually managing the resources.

Clicking the "Properties" option in the right-click menu during
a search causes Nautilus to crash since the Properties dialog
handles files and directories, not search-view-directories.

Lets disable the "Properties" option when in search view.

Fixes #1491