Using with ReactList is working weired

Reference : ReactList : https://www.npmjs.com/package/react-list - helps me getting virtual scrolling

When I am using react-sortable-hoc, after selecting the item if I drag and scroll a bit, the item is acting weird with the dropped area.

Start by reproducing the interaction described with ReactList and react-sortable-hoc: select an item, drag, scroll slightly, and inspect its dropped position. Compare the behavior with and without virtual scrolling; done means the selected item consistently lands in the intended drop area when scrolling during a drag.

Written by the indexing model from the issue text.