[Interest] bug with Qt example --draggableicons

[梁伟钟]

Hello, I'm writing this email to report a bug with Qt example
Draggableicons .

Follow these steps to repeat how the program crash.
1. drag a icon outside the widget .
2. spinning the mouse with the icon fast( outside the widget).
3. release it suddenly when spinning .
Then the program would crash .

As I am working on  something like drag and drop according to this example
, I wonder what should I do to avoid this bug .

  lwz
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