Mac: QImage::drawText() can miss pixel in some characters when drawn with some fonts at small sizes

QImage can in some cases draw text wrongly when comparing it to how QPixmap draws it.

This only happens on Mac.

Reproducible with the following example:

• The letter '7' in the bad.png is missing a pixel.
  #include <qpainter>
  #include <qimage>
  #include <qpixmap>
  #include <qapplication>
  #include <qcolor>

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

QPixmap pm(QSize(100, 100));
pm.fill(QColor(0, 0, 0, 0));
QFont f("Courier", 8);
f.setStyleHint(QFont::AnyStyle, QFont::NoAntialias);

QPainter ppm(&pm);
ppm.setFont(f);
ppm.setPen(Qt::white);

ppm.drawText(QRect(0, 0, 100, 100), 0x484, "012345678 abcdefg");
pm.save("good.png", "PNG");

QImage img(QSize(100, 100), QImage::Format_ARGB32);

QPainter imgP(&img);
imgP.setFont(f);
imgP.setPen(Qt::white);

imgP.drawText(QRect(0, 0, 100, 100), 0x484, "012345678 abcdefg");

img.save("bad.png", "PNG");
}