QSpinBox continues to change value when cursor leaves widget

A QSpinBox will continue to change its value when the user drags the cursor out of the widget.

To reproduce, create a QSPinBox and very (very) quickly click the up button to increase the number in the QSpinBox and without releasing the mouse press, drag the cursor out of the widget.

The value continues to change although it should stop when the cursor leaves the widget.