Originally reported at https://bugzilla.redhat.com/show_bug.cgi?id=750657 and it took me a while to understand what the reporter complained about, but indeed there is a minor bug or at least an inconsistent behavior of the thumbnail bar. Test 1: a) Open the first image in a folder: Thumbnail bar runs form the middle of the screen (selected image) to the right (given that there are enough pictures in the folder. b) Open the last image in the folder. Thumbnail bar now runs from middle to the left. So far, so good. Test 2: a) Open first image again, focus the thumbnail bar and scroll up with the mouse wheel. Bar stops before the first thumbnail leaves the window on the right. b) Open last image, focus thumbnail bar and scroll down. Bar does not stop at the last image but completely disappears to the left, but it should stop at the last thumbnail. Tested with ristretto 0.2.2.
This bug is fixed for 0.1, 0.2 and master with the following commit: http://git.xfce.org/apps/ristretto/commit/?id=986ca3d80cca5a4874d7350cab6210a26a9ed943 (oops, I forgot to rebase)