QPainter warnings when docking/undocking QDockWidget in QMainWindow when .svg icon set on QMainWindow.

Setting a .svg image as a QMainWindow's icon, causes the following warning messages to be output when a QDockWidget within the QMainWindow is docked/undocked.

QPainter::begin: Paint device returned engine == 0, type: 3
QPainter::save: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::brush: Painter not active
QPainter::setBrush: Painter not active
QPainter::pen: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::opacity: Painter not active
QPainter::brush: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setOpacity: Painter not active
QPainter::drawPath: Painter not active
QPainter::setPen: Painter not active
QPainter::setOpacity: Painter not active
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::end: Painter not active, aborted

Discussed here: http://code.google.com/p/spyderlib/issues/detail?id=1314