Rewinding AnchorChanges should not make target item's implicit width and height explicit

Task-number: QTBUG-12273
Reviewed-by: Michael Brasser
(cherry picked from commit 164b2b54922d87a44a60efe6dbbe2fa3b7716820)

3 files changed, 78 insertions, 2 deletions

diff --git a/src/declarative/util/qdeclarativestateoperations.cpp b/src/declarative/util/qdeclarativestateoperations.cpp
index 51e6f99..27d4b2d 100644
--- a/src/declarative/util/qdeclarativestateoperations.cpp
+++ b/src/declarative/util/qdeclarativestateoperations.cpp
@@ -1501,8 +1501,12 @@ void QDeclarativeAnchorChanges::rewind()
 
     d->target->setX(d->rewindX);
     d->target->setY(d->rewindY);
-    d->target->setWidth(d->rewindWidth);
-    d->target->setHeight(d->rewindHeight);
+    if (targetPrivate->widthValid) {
+        d->target->setWidth(d->rewindWidth);
+    }
+    if (targetPrivate->heightValid) {
+        d->target->setHeight(d->rewindHeight);
+    }
 }
 
 void QDeclarativeAnchorChanges::saveCurrentValues()
diff --git a/tests/auto/declarative/qdeclarativestates/data/anchorRewindBug.qml b/tests/auto/declarative/qdeclarativestates/data/anchorRewindBug.qml
new file mode 100644
index 0000000..e6b6020
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativestates/data/anchorRewindBug.qml
@@ -0,0 +1,37 @@
+import Qt 4.7
+Rectangle {
+    id: container
+    color: "red"
+    height: 200
+    width: 200
+    Column {
+        id: column
+        objectName: "column"
+        anchors.left: container.right
+        anchors.bottom: container.bottom
+
+        Rectangle {
+            id: rectangle
+            color: "blue"
+            height: 100
+            width: 200
+        }
+        Rectangle {
+            color: "blue"
+            height: 100
+            width: 200
+        }
+    }
+    states: State {
+        name: "reanchored"
+        AnchorChanges {
+            target: column
+            anchors.left: undefined
+            anchors.right: container.right
+        }
+        PropertyChanges {
+            target: rectangle
+            opacity: 0
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/auto/declarative/qdeclarativestates/tst_qdeclarativestates.cpp b/tests/auto/declarative/qdeclarativestates/tst_qdeclarativestates.cpp
index 639b2f3..7bc4fd4 100644
--- a/tests/auto/declarative/qdeclarativestates/tst_qdeclarativestates.cpp
+++ b/tests/auto/declarative/qdeclarativestates/tst_qdeclarativestates.cpp
@@ -121,6 +121,7 @@ private slots:
     void anchorChanges4();
     void anchorChanges5();
     void anchorChangesCrash();
+    void anchorRewindBug();
     void script();
     void restoreEntryValues();
     void explicitChanges();
@@ -807,6 +808,40 @@ void tst_qdeclarativestates::anchorChangesCrash()
     delete rect;
 }
 
+// QTBUG-12273
+void tst_qdeclarativestates::anchorRewindBug()
+{
+    QDeclarativeEngine engine;
+
+    QDeclarativeComponent rectComponent(&engine, SRCDIR "/data/anchorRewindBug.qml");
+    QDeclarativeRectangle *rect = qobject_cast<QDeclarativeRectangle*>(rectComponent.create());
+    QVERIFY(rect != 0);
+
+    QDeclarativeItem * column = rect->findChild<QDeclarativeItem*>("column");
+
+    QVERIFY(column != 0);
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->heightValid);
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->widthValid);
+    QCOMPARE(column->height(), 200.0);
+    QDeclarativeItemPrivate::get(rect)->setState("reanchored");
+
+    // column height and width should stay implicit
+    // and column's implicit resizing should still work
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->heightValid);
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->widthValid);
+    QCOMPARE(column->height(), 100.0);
+
+    QDeclarativeItemPrivate::get(rect)->setState("");
+
+    // column height and width should stay implicit
+    // and column's implicit resizing should still work
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->heightValid);
+    QVERIFY(!QDeclarativeItemPrivate::get(column)->widthValid);
+    QCOMPARE(column->height(), 200.0);
+
+    delete rect;
+}
+
 void tst_qdeclarativestates::script()
 {
     QDeclarativeEngine engine;