Fix PinchHandler.persistentTranslation; test cumulative native gestures

Since we do not want persistentTranslation to be always the same as
target.position, clearly we cannot use xAxis/yAxis to store the initial
target position: thus the startPos() function was wrong, and is now
removed. We need to store it in a separate m_startTargetPos variable
like DragHandler does, and as PinchHandler did before
7867a683fcb938939fb2837a26ac8e1941e3fe08.

Add an internal doc comment to clarify the arguments to
QQuickItemPrivate::adjustedPosForTransform().

tst_QQuickPinchHandler::cumulativeNativeGestures() now checks the result
of adjustedPosForTransform(): how far the target item moved.

Pick-to: 6.5
Fixes: QTBUG-111220
Change-Id: I04237cb82a1abaaeab873a0d887acaf322f262ce
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 8 insertions, 1 deletions

diff --git a/tests/auto/quick/pointerhandlers/qquickpinchhandler/data/pinchproperties.qml b/tests/auto/quick/pointerhandlers/qquickpinchhandler/data/pinchproperties.qml
index 37f22c949a..bf01c401a8 100644
--- a/tests/auto/quick/pointerhandlers/qquickpinchhandler/data/pinchproperties.qml
+++ b/tests/auto/quick/pointerhandlers/qquickpinchhandler/data/pinchproperties.qml
@@ -35,7 +35,14 @@ Rectangle {
         }
     }
 
-    Text { color: "magenta"; z: 1; text: "scale: " + blackRect.scale}
+    Text {
+        color: "magenta"
+        z: 1
+        text: "scale: " + blackRect.scale +
+              "\npos: " + blackRect.x.toFixed(2) + ", " + blackRect.y.toFixed(2) +
+              "\ntranslation: active " + pincharea.activeTranslation.x.toFixed(2) + ", " + pincharea.activeTranslation.y.toFixed(2) +
+              "\n  persistent " + pincharea.persistentTranslation.x.toFixed(2) + ", " + pincharea.persistentTranslation.y.toFixed(2)
+    }
 
     Rectangle {
         id: blackRect