bug#60205: Dino lacks some icons

[Liliana Marie Prikler <liliana.prikler@gmail.com>]

Am Montag, dem 19.12.2022 um 16:14 +0000 schrieb Tirifto:
>   ** (dino:17647): CRITICAL **: 17:06:11.642: file /tmp/guix-build-
> dino-0.3.1.drv-0/dino-0.3.1/main/src/ui/main_window.vala: line 68:
> uncaught 
> error: Unrecognized image file format (gdk-pixbuf-error-quark, 3)
>   
>   (dino:17647): Gtk-WARNING **: 17:06:11.676: Found an icon but could
> not load 
> it. Most likely gdk-pixbuf does not provide SVG support.
>   
>   (dino:17647): Gtk-WARNING **: 17:06:11.680: Could not load a pixbuf
> from 
> icon theme.
>   This may indicate that pixbuf loaders or the mime database could
> not be found.
These two lines appear to mark the most likely culprit.  Now, normally
our gdk-pixbuf packages do support svg, but there's some strings
attached.  Most of our GNOME related programs are tested in a GNOME
environment rather than a pure one, which means that things that
shouldn't work happen to do.  Compare the output of

  guix shell --pure -E DISPLAY dino librsvg adwaita-icon-theme -- dino

to

  guix shell --pure -E DISPLAY dino -- dino

Note that librsvg is a regular input to dino and should thus be
available as a pixbuf loader.  I'm not sure what exactly is wrong here
(perhaps dino should swap its librsvg input for gdk-pixbuf), but
another caveat is that on non-x86_64 systems we are forced to use a
pre-Rust version of librsvg, which barfs on some particular input
files.

Hope that helps.

Cheers