QQuickAnchorChanges: Keep geometry bindings on reverse() and rewind()

This is in line with what we do in other reverse() and rewind() methods.
Unfortunately we need to dig deep into the QQuickItem internals in order
to get all the flags and callbacks right.

Fixes: QTBUG-101186
Change-Id: Icde1a1b2dab1b9cab5adcbc28485a7526a8ac2b7
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit 247efb9a343a14bb12805e56e4950919071d9395)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 55 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickstates/data/anchorRewind.qml b/tests/auto/quick/qquickstates/data/anchorRewind.qml
new file mode 100644
index 0000000000..740c94cf42
--- /dev/null
+++ b/tests/auto/quick/qquickstates/data/anchorRewind.qml
@@ -0,0 +1,31 @@
+import QtQuick
+
+Item {
+    width: 400
+    height: 400
+    Item {
+        id: outer
+        anchors.fill: parent
+        Item {
+            id: inner
+            width: parent.width / 2
+            height: parent.height / 2
+            anchors.left: parent.right
+            anchors.top: parent.bottom
+        }
+        states: [
+            State {
+                when: true
+                AnchorChanges {
+                    target: inner
+                    anchors.left: outer.left
+                    anchors.top: outer.top
+                }
+            }
+        ]
+        transitions: Transition {
+            AnchorAnimation {}
+        }
+    }
+}
+
diff --git a/tests/auto/quick/qquickstates/tst_qquickstates.cpp b/tests/auto/quick/qquickstates/tst_qquickstates.cpp
index 788b9c68ec..d6814bd057 100644
--- a/tests/auto/quick/qquickstates/tst_qquickstates.cpp
+++ b/tests/auto/quick/qquickstates/tst_qquickstates.cpp
@@ -206,6 +206,7 @@ private slots:
     void bindableProperties();
     void parentChangeInvolvingBindings();
     void deferredProperties();
+    void rewindAnchorChange();
 };
 
 void tst_qquickstates::initTestCase()
@@ -1954,6 +1955,29 @@ void tst_qquickstates::deferredProperties()
     QCOMPARE(root->height(), 100.0);
 }
 
+void tst_qquickstates::rewindAnchorChange()
+{
+    QQmlEngine engine;
+    QQmlComponent c(&engine, testFileUrl("anchorRewind.qml"));
+    QVERIFY2(c.isReady(), qPrintable(c.errorString()));
+    QScopedPointer<QObject> root(c.create());
+    QVERIFY(root);
+
+    QQmlContext *context = qmlContext(root.data());
+    QVERIFY(context);
+
+    QObject *inner = context->objectForName(QStringLiteral("inner"));
+    QVERIFY(inner);
+
+    QQuickItem *innerRect = qobject_cast<QQuickItem *>(inner);
+    QVERIFY(innerRect);
+
+    QTRY_COMPARE(innerRect->x(), 0);
+    QTRY_COMPARE(innerRect->y(), 0);
+    QTRY_COMPARE(innerRect->width(), 200);
+    QTRY_COMPARE(innerRect->height(), 200);
+}
+
 QTEST_MAIN(tst_qquickstates)
 
 #include "tst_qquickstates.moc"