QPainter crash when generating icon after drag-drop

[craigTheBrit]

That does indeed prevent a crash. I thought I had solved it by moving the update() call that was coming from a successful drop on the target side to just after [QDrag]->exec() on the source side (using the drop target from QDrag info).

Now you've made me think about what's happening here more carefully. Does that mean that the QIcon keeps hold of the QPixmap? If I do create it on the heap, who's reponsible for deleting it? Apologies if this seems like a daft question...

[high_flyer]

Does that mean that the QIcon keeps hold of the QPixmap?

No, it means exactly the opposite.
If the QIcon had its own deep copy, it wouldn't need the external pixmap object to stay alive.

If I do create it on the heap, who's reponsible for deleting it? Apologies if this seems like a daft question...

Not darf at all, would be better if more people would think that far to ask it.
The answer depends on how you allocate your pixmap.
If you give it a QObject parent, you don't have to worry about destruction, the parent will.
If its parent-less, you will have to take care of deleting it.