bug#43220: Eog not starting

[Andreas Enge]

Hello,

when trying to run eog, I get the following message:
(eog:4813): GLib-GIO-ERROR **: 11:49:04.247: Settings schema 
'org.gnome.desktop.thumbnailers' is not installed
Trace/breakpoint trap

Comments on help-guix in this thread:
   https://lists.gnu.org/archive/html/help-guix/2020-09/msg00001.html
suggest to install gsettings-desktop-schemas, and this solves the problem.

However, I would consider this a dependency error, and there is one obvious
solution, to make gsettings-desktop-schemas a propagated input of eog.
In the help-guix thread, it was also suggested to maybe wrap the call to eog.

And it is possible this would have to be done for every gnome package.

Andreas