QRect with negative width/height results in the pen being drawn in the wrong place

// Qt 5 code

#include <QtGui>
#include <QtWidgets>

class PainterWidget : public QWidget
{
    void paintEvent(QPaintEvent *)
    {
        QPainter painter(this);
        painter.setBrush(QBrush(Qt::red, Qt::SolidPattern));
        QRect rectLeft(100, 100, -50, -50);
        QRect rectRight(200, 100, -50, -50); // same width/height as rectRight
        painter.drawRect(rectLeft);
        painter.drawRect(rectRight.normalized());
    }
};

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

    PainterWidget widget;
    widget.show();

    return a.exec();
}