Timeline instrument names do not scroll when scroll. Happens on linux, not windows.

On latest nightly 042d5b4. If I create a new score and add a bunch of instrumnets, then in the timeline (F12) I can see all the rows for the new instruments. If I decrease the height of the timeline, then I only see a subset of instrumnets, which is fine, but the problem is when I use the scroll bar to or middle mouse scroll wheel to scroll down, then only the timeline cells will scroll, but not the first column of instrument names. According to Joshua, this doesn't happen on windows, so this might be a Linux-only bug.