Actually I'd say it is quite intuitive once you know how dragging works in Qt and what the relation between the graphics view and graphics scene is.
Because you might want to accept drops only on certain areas of a widget and the user needs a visual hint to know if he can make a drop at a certain place before he decides to do it.Why I have to accept Move events to get a Drop event, I shall never know, but here it is! :-)
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