changeset view inserts horizonral scrollbars (BB-5042)

While viewing a changeset, I noticed that horizontal scroll bars are on top of the source code, making that line unreadable. The horizontal scroll bars don't appear to be attached to anything, so they offer no functionality except to obscure the text underneath.

I have attached a screenshot of the problem, which should show better what I am trying to explain. I can supply a copy of the changeset, but it appears that I am only allowed one attachment and that there is a character limit to issue submission that is shorter than the changeset, so I can't insert it inline.

This occurs in both firefox 14 and chromium 18 on ubuntu 12.4. The problem could also be seen on my colleagues machine, running firefox on windows 7.