Full press-drag-release done event

[Nir Lisker]

Hi all,

I've noticed that the full press-drag-release MouseDragEvent doesn't have
an event type that signals the end of the drag process. In DnD, there is
DragEvent.DRAG_DONE that signals the end of the drag-and-drop process
regardless of the result and the mouse location it was released
at, including outside of the application.

Adding a MouseDragEvent.MOUSE_DRAG_DONE is useful for applications that
want to act when the process finishes regardless of the result. Currently,
the "latest" event that can be delivered is a MOUSE_DRAG_RELEASED type, but
it can only be delivered if the event ends on a node that registered for
it. If the mouse is released outside of the application or on a node that
hasn't registered for it, there will be no notification that the drag chain
ended.

I propose adding this event type and the appropriate property on Scene and
Node. The modification seems rather simple in my prototype.

Thoughts?

-- Nir
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