Improvements
It's now possible to place multiple Droppables within a shared scroll container. To achieve this we had to re-work the way that we capture a Droppable's dimensions, so that we can calculate its true visible bounds on the screen throughout a drag. This means we're now correctly taking into account window scroll, parent scroll, and internal scroll when working out a Droppable's area. Keep in mind that we still only support one scroll container + window scroll, though.
Here's a diagram we put together while we were working on this which captures some of the scenarios we cover:
