Right. This is probably another manifestation of the design where long URLs also force the active area of the window to be wide enough to accommodate their full length, so messages have to be scrolled horizontally. Having to do it when a thread contains a long URL is a minor annoyance, since URLs long enough to make this happen don't show up very often, but the jump table does it to every window.

The easiest fix is probably to shorten the descriptions of each area.