Comment 2 for bug 1535272

I've added UX to the bug so they can think of how this should work, as they've requested the divider area to be as it is now.

My humble opinion is that there's no clear way to get this done properly. Checking Crusader for instance the scrollbar there is always visible, and the sensing area of the divider starts right at the right edge of the scrollbar. But Crusader has thicker divider, so there is enough space to hit the divider to resize. Maybe we want something similar.