Jerky transitions in lists with items of varying height (reproducible in your example)

http://clauderic.github.io/react-sortable-hoc/#/basic-configuration/elements-of-varying-heights?_k=7aixc4

If the bottommost item has a small height and you're trying to drag a tall item below it, the small item will jump up and down randomly as your cursor moves around the very bottom of the list.


Reproduce the behavior in the linked Elements of Varying Heights example, focusing on dragging a tall item below a short bottommost item. Trace the sortable-list drag and transition behavior involved in the jump, then verify that the bottom item remains stable while dragging.

Written by the indexing model from the issue text.