QPainter::drawGlyphRun fails to draw underlines

When using QPainter::drawGlyphRun with a glyph run that has underline or strikeOut enabled, the underline is not painted if the widget's position is not 0,0. ( See example, click "Fix Me" to move widget back to 0,0  )

The reason seems to be that the 
QCosmeticStroker has a broken matrix in its state which means that all lines are clipped away. ( QCosmetic is only used on non-retina displays, the bug is the same on retina as well )