When drawing multiple distinct (unconnected) lines (e.g. from
QPainter::drawLines() or a QPainterPath with alternating
movetos/linetos), the dash pattern should not continue from one to the
next, as it should when drawing a connected line (e.g. polyline).
Both the cosmetic stroker and the full stroker does it right, but the
fast rasterizing codepath got it wrong.
Fixes: QTBUG-83048
Change-Id: I3d090f7121726755a0e53cb66b99a5563ac0e1c0
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>