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owned by a parent QObject E.g. QGraphicsItem subclasses are not QObjects themselves, but are owned by a QObject QGraphicsScene. Depending on whether the graphics item is deleted first or the scene, we can end up with a double-free situation. Fix this by creating a QObjectParentUniquePtr smart pointer which is automatically nulled if the parent QObject (e.g. the QGraphicsScene) is deleted first. (Adapted from existing QObjectUniquePtr logic and logic in QgsSnapIndicator)