Dear Maintainer, ristretto does not display gif images correctly. Instead only few 'rows' of image is displayed. I can reproduce this with every gif image I've tested yet. There is a corresponding report in the ubuntu BT: https://bugs.launchpad.net/ubuntu/+source/ristretto/+bug/1315558
I can confirm the bug here, see the .png attached for a screenshot of the faulty display, the .gif is the original file. The thumbnails in the panel of ristretto show fine, with the full image.