If my scene contains for instance two squares, one 100 by 100 (square A), and one 50 by 50 (square B), where B is a child of A, in the middle of it: when I drag from the outside, I see:

• dragEnter A
• dragMove A
• dragMove A
• dragEnter B
• dragMove B
• drop B

So B knows that the drop has ended, but A never gets any notification. I believe the QGraphics system should always make sure that events always follow a state machine cycle enter -> move -> drop or leave, e.g. no item should ever stay in the dragMove state if the user has released the mouse.