Incorrect filled path when using QPainterPath::cubicTo() and combined transformations

Incorrect filled path when using QPainterPath::cubicTo() and combined transformations

Test case main.cpp to reproduce
==============================
#include <QtGui>
class MainWindow : public QWidget
{
Q_OBJECT
public:
MainWindow(QWidget *parent=0);
void paintEvent(QPaintEvent*);
};
MainWindow::MainWindow(QWidget *parent)
: QWidget(parent)
{
resize(400,400);
}
void MainWindow::paintEvent(QPaintEvent *)
{
QRect r = rect();
qreal w = width();
qreal h = height();
QImage image(r.width(), r.height(),
QImage::Format_ARGB32_Premultiplied);
// create painter
QPainter painter(&image);
painter.setRenderHints(QPainter::Antialiasing);
// blan image
painter.fillRect(image.rect(), Qt::white);
// setup transform
painter.translate(w/2, h/2);
qreal s = qMin(w,h)/250.0;
painter.scale(s,s);
QTransform t;
t.rotate(45, Qt::XAxis);
painter.setTransform(t, true);
// setup path
QPainterPath path;
path.moveTo(QPointF(-100,-100) );
path.cubicTo(-100,100,100,-100,100,100);
path.closeSubpath();

QBrush b(Qt::red);
painter.fillPath(path, b);

QPen p(Qt::blue, 5, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
p.setMiterLimit(10);
painter.setPen(p);
painter.drawPath(path);

QPainter painter1(this);
painter1.drawImage(0,0,image);
}
int main(int argc, char **argv)
{
QApplication a(argc,argv);
MainWindow m;
m.show();
a.exec();
}
#include "qttest.moc"