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Related to !10.

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We already depend on libxfce4util, it's the same code in one line, and
the check for `bind_textdomain_codeset()` was not done here while it is
done in libxfce4util, which is safer: see
https://www.gnu.org/software/gnulib/manual/html_node/bind_005ftextdomain_005fcodeset.html

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It shouldn't happen, but it does: see e.g.
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/204.

Related to xfce/tumbler#44 (comment 42317).

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And move patches to a dedicated directory.

Related to xfce/xfconf!19.

Related to !35.

This makes the Flatpak application self-contained from a thumbnail
perspective, as it was already from a configuration perspective. So
there is no need to worry about whether we are in the Flatpak context
when building the thumbnail path: the cache directory is always
`$XDG_CACHE_HOME`, which varies depending on the context.

Related to xfce/tumbler!21, see !35 for more details.

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Closes #82.

While this is inconsequential in the current state of the code (the
maximum thumbnail size is less than `RSTTO_THUMBNAIL_FLAVOR_LARGE`),
this fallback is implemented in the wrong place.

Furthermore, it is actually not clear that it should be implemented,
because by the time support for larger sizes is added, an explicit
dependency on Xfce 4.18 could also be added (e.g. libxfce4util 4.18), so
that support for "x-large" and "xx-large" flavors could be assumed as a
prerequisite.

Amends previous commit.

This allows for better quality thumbnails for sizes larger than 128x128.
This currently only concerns sizes 192x192 and 256x256 ("large" flavor),
but support is extended virtually to 512x512 and 1024x1024 ("x-large"
and "xx-large" flavors).

This allows to partially address #81 in anticipation of the release of
Tumbler 4.18.

* Move thumbnail size management to `util.c`
* Rename `THUMBNAIL_SIZE_*` to `RSTTO_THUMBNAIL_SIZE_*`
* Avoid switch statements on thumbnail size in `icon_bar.c`
* Some more cleanup in `icon_bar.c`

In the sense of a progression by power of 2 with an intermediate median
size.

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A mistake in a849a320.

Fixes #77.

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