GNOME Files (nautilus) does not display thumbnails of files like images,
videos, and other files that usually have thumbnails. This makes it hard to
browse large directories of multimedia files.
## Steps to reproduce
1. Start GNOME Files.
2. Make sure that "GNOME Files → Preferences → Search & Preview → Thumbnails"
is active ("Files on this computer" is the option selected in my case for files
less than 10 MB).
3. Browse to a directory that contains images.
## Unexpected result
All images are represented by the same icon, so you can only differentiate them
by file name (when the files are not generated by devices like cameras).
Screenshot:
https://multimedialib.files.wordpress.com/2020/01/guix-gnome-files-3.32.3-no-image-previews-2020-01-13.png
## Expected result
You can see thumbnails of all images so you can browse them by their content,
not only by their file name.
## System information
GNOME 3.32.2
GNOME Files 3.32.3-stable
$ LANG=C guix describe
Generation 8 Jan 12 2020 16:24:29 (current)
guix f9ea47a
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: f9ea47a978882541063dd0d77c138be881ce0688
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https://sirgazil.bitbucket.io/
