image file chooser does not display images thumbnails

[G.M.]

Hi,

I'm using Xubuntu 20.04. lightdm-gtk-greeter-settings version 1.2.2-3 is installed.

- Open lightdm-gtk-greeter-settings
- Select radio button to get an "Image" background
- Click the image chooser "button"
- In my distribution, the FileChooser opens in the /usr/share/backgrounds directory

The FileChooser does not display the image thumbnails. This is not very convenient to select an image. I'm almost sure I saw image thumbnails in other Gtk FileChoosers (e.g. in gimp, but there it might be their own dialogbox?).

What's worse is that this Gtk FileChooser does not allow to copy the current path (CTRL-L opens an emptyeditor line), thus one cannot easily copy the "/usr/share/backgrounds" path in an image viewer application (see bug report here: https://gitlab.gnome.org/GNOME/gtk/-/issues/2443)