the method is called when an item is moved out of a possible drop landing during dnd
|source||HTMLElement||a DOM element from which a drag-n-drop action has started|
|old_target||HTMLElement||a DOM element of the drop from which an item has been moved out|
|new_target||HTMLElement||a new DOM element which will be used as a drop target (can be null)|
|ev||Event||a native HTML event|
The method is not purposed for direct call! It is an extension point.
You can override it with your own logic, but check drag-n-drop related events first, as they provide a much more convenient way for drag-n-drop handling.