QPainterPath will not add a null element
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AFAIK it is undocumented that appending a null element, for example a lineTo(the current end point of the path), doesn't actually add anything to a QPainterPath.
@
path = QPainterPath(QPointF(0,0))
path.lineTo(QPointF(1,1))
previousCount = path.elementCount()
path.lineTo(QPointF(1,1))
assert path.elementCount() > previousCount@The assertion fails. I can understand the reason for it, but it did catch me by surprise.