[OSX]Broken gesture delivery

#include <QWidget>
#include <QApplication>
#include <QDebug>

class Widget : public QWidget
{
public:
  Widget(QWidget *parent = 0):
    QWidget(parent)
  {
    grabGesture(Qt::PinchGesture);
  }

  bool event(QEvent *);
};

#include <QPinchGesture>
bool Widget::event(QEvent* e)
{
  if(e->type() == QEvent::Gesture)
  {
    QGestureEvent* ge = static_cast<QGestureEvent*>(e);

    ge->accept(Qt::PinchGesture); //< not really needed
    
    if(QPinchGesture* pinch = static_cast<QPinchGesture *>(ge->gesture(Qt::PinchGesture)))
    {
      qDebug()<<pinch->state();
    }

  }

  return QWidget::event(e);
}

int main(int argc, char ** argv)
{
  QApplication app(argc, argv);

   Widget w;
   w.show();

   return app.exec();
}