48b1af941c
A typical usage for mapping a 4-point polygon to a rectangle might be
QTransform transform;
bool ok = QTransform::quadToQuad(polygon, polygon->boundingRect(),
transform);
It works because the QPolygonF(QRectF) ctor is implicitly called on
the second argument; but that ctor turns it into a 5-point polygon.
So it should be legal for QTransform functions to work with 5-point
closed paths.
Fixes: QTBUG-21329
Change-Id: Iae249012e14b8a3e8d3b0dfa35da8f9759359832
Pick-to: 5.15 6.5 6.8 6.9
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>