When viewing the source (and diff) of a submission, both the whole page and the source frame have a scrollbar. This is really annoying and we should make sure that only one of these has scrollbar by either

1. make the source frame as high as required to show the full source without a scrollbar
2. make the source frame small enough to render on the page without requiring a scrollbar

I think the first option is best as the second would break when you resize the browser window (or you'd have to dynamically scale the source code frame too.