SVG transparency rendering problem (QTBUG-4908) still not fixed in 4.8.5

There's a problem with SVG rendering with the QSvgRenderer. Transparency is not rendered correctly; areas supposed to be transparent, are displayed as gray/white. Provided example code is used in rendering SVG-graphics. Attached SVG file can be used to verify the problem.

QSvgRenderer renderer(svgFileName);
m_pixmap = QPixmap(renderer.defaultSize());
m_pixmap.fill(Qt::transparent);
QPainter painter(&m_pixmap);
renderer.render(&painter);

This bug was closed as fixed in 4.6 (QTBUG-4908) but still persists.