QPainter::drawPolyline hang with Antialiasing switched on

When Antialiasing is switched on I can reproducibly cause Qt to hang when drawing a polyline, under Fedora 12 Linux, x86-64. This may be because the dataset includes a large number of very similar points.

Please compile and run the attached program. The main routine just does this:

void Win::paintEvent(QPaintEvent*)
{
QPainter painter(this);

QPolygonF poly;
for(size_t i = 0; i != numpts; i++)

// crashes with line below enabled
painter.setRenderHint(QPainter::Antialiasing, true);

painter.drawPolyline(poly);
}