Incorrect preview on Chrome after drag-scrolling page

[arackaf]

A bit hard to explain, but basically, when dragging an item up to the top of the page, such that the page has to scroll up, when you bring the dragging item back down, into the page, the drop preview always shows as though you're over a valid drop target.

Somehow dragging an item up, and causing a page scroll fools the backend into thinking you're always over a valid drop target.