QRubberBand do not adjust the position when view resize

[tham]

When I resize the QGraphicsView, the position of the QRubberBand do not adjust as expected.

This is the origin position of the rubberband

origin position

After I resize the QGraphicsView

new position

The position of the rubber do not stay at the same position again, I try to solve this problem by override the resizeEvent of QGraphicsView, but it do not work

void img_region_selector::resizeEvent(QResizeEvent *e)
{
    QGraphicsView::resizeEvent(e);

    auto const old_size = e->oldSize();
    auto const cur_size = e->size();    
    auto const diff = cur_size - old_size; 
    QPoint const offset(diff.width(), diff.height());   
     rb->move(rb->pos() + offset);     
}

The img_region_selector is the child of QGraphicsView.

The source codes are located at github.

Thanks