Accidental detach in qt_bitmapToRegion

QRegionPrivate *qt_bitmapToRegion(const QBitmap& bitmap)
{
    QImage image = bitmap.toImage();
 
...
    for (y = 0; y < image.height(); ++y) {
        uchar *line = image.scanLine(y); // <<<<<<<<<<< detach here - uses non-const scanLine() when it doesn't need to.
        int w = image.width();
        uchar all = zero;
        int prev1 = -1;
        for (x = 0; x < w;) {
            uchar byte = line[x / 8];

        const uchar *line = image.scanLine(y);