REG: Glyph position wrong in DirectWrite font engine

1. Configure Qt with -directwrite.
2. Edit the richtext/textedit example by setting PreferNoHinting on the default font:

    QFont font = textEdit->font();
    font.setHintingPreference(QFont::PreferNoHinting);
    textEdit->setFont(font);

3. Run it to see the awful mess. (This looks correct in Qt 4.8. Make the same modification to the textedit demo there to compare.)