I tested with overlay scrollbars disabled, and I noticed the following:
Scrolling with the mouse wheel does not work (in either case).
Scrolling by clicking the scrollbar _does_ work.
You can scroll if you click an empty area in the list and use the arrow keys.
The thumb for the overlay scrollbar never appears.
There is a bug report upstream, so I'm linking to that one. I'm adding overlay scrollbars to the bug report, too, because of the problem with the thumb.
I tested with overlay scrollbars disabled, and I noticed the following:
Scrolling with the mouse wheel does not work (in either case).
Scrolling by clicking the scrollbar _does_ work.
You can scroll if you click an empty area in the list and use the arrow keys.
The thumb for the overlay scrollbar never appears.
There is a bug report upstream, so I'm linking to that one. I'm adding overlay scrollbars to the bug report, too, because of the problem with the thumb.