The size of each individual tab, representing the open resources within a single panel, has increased quite a bit with L8. I regularly have more tabs open in a panel than can be displayed horizontally across the top of the panel. In that situation, a small, round arrow pointing to the right is displayed allowing me to scroll to the undisplayed tabs. So far so good.
Unfortunately, I have to click that arrow 3-4 times to get completely from the rightmost visible tab to the next tab. Same thing if the left arrow is displayed. Each click seems to move in terms of a number of pixels rather than in a unit logically-related to what's being scrolled (in this case, a tab).
It seems reasonable to me that one click of the right / left scroll arrows should move one entire tab. It would be great if you could improve that behavior. It's not very usable right now.
Thanks,
Donnie