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: 6.5 5.15
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
(cherry picked from commit 48b1af941c50ab28cc92f9ea65a8a74a32eaf2bc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 5ead2a3d63a905ed758390e1558dbac744756077)
f5000beeb6