Mac style leaks memory with indicators

#include <QApplication>
#include <QStyle>
#include <QPainter>
#include <QImage>
#include <QStyleOption>
#include <qgraphicsview.h>
#include <qgraphicsscene.h>
#include <QGraphicsWidget>
#include <QRadioButton>
#include <QTimer>
#include <QDebug>
class W : public QGraphicsWidget{
    void paint(QPainter* p, const QStyleOptionGraphicsItem* option, QWidget*){
        QStyleOptionButton opt;
        opt.rect=option->rect;
        opt.state=QStyle::State_On|QStyle::State_Enabled;
        for (int i = 0; i < 20; ++i)
            qApp->style()->drawControl(QStyle::CE_RadioButton, &opt, p);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QGraphicsView view(new QGraphicsScene);
    auto radio = new W;
    view.scene()->addItem(radio);
    view.show();
    QTimer t;
    t.start(1);
    QObject::connect(&t, &QTimer::timeout, [radio](){
        radio->update();
    });
    a.exec();
}