Is there a way to know the group that that an item is dragged over?

[genu]

While dragging over groups, should be able to detect when dragged item leaves or enters a group's bounds.

Consider adding a @sort-group-leave and @sort-group-enter or similar that fires when a dragged item leaves a specific group's bounds.

This would enable handling group hovers, and the like when dealing with many different groups (e.g. Dragging events in a calendar month view)