QTreeWidget dragging image doesnt include the itemWidget drawing

The dragging image of QTreeWidget only has the original model item drawing. even if I use `void QTreeWidget::setItemWidget(QTreeWidgetItem * item, int column, QWidget * widget)`.

However, if I ever do a setItemWidget, what user see should be the item widget, or item widget blended with the model cell below. I expect the dragging image should be the same