I saw bug 3341, was fixed, and was looking at my uploads on commons. I noticed that the special:listfiles doesn't handle extremely narrow images very well.
For example: http://commons.wikimedia.org/w/index.php?title=Special:ListFiles&offset=Wn-gradient.pn&sort=img_name&limit=1
Observed behaviour: thumbnail is 180x80820 px (!)
Expected behaviour: In extreme cases such as this, don't scale it so it fulls the width of the entire column. I think a reasonable max width cut off would be 500px.
Version: unspecified
Severity: trivial
URL: http://commons.wikimedia.org/w/index.php?title=Special:ListFiles&offset=Wn-gradient.pn&sort=img_name&limit=1