Ristretto should show image description from metadata when viewing images

Submitted by gry..@..il.com

Assigned to Stephan Arts

Link to original bug (#10914)

Description

In GIMP, there is a description field which goes to file metadata. When I open such image in Ristretto, no description is shown.

I would like Ristretto to show any such caption when viewing an image. It would also be nice if it let me edit such caption for me to view and annotate pictures without installing GIMP.