QmlDesigner: Fix state shown after reordering

Fix an issue which caused the wrong state to be shown in the form editor
after reordering the states in the state editor.

Task-number: QDS-7753
Change-Id: I220bb5b11beb4f9bfc6a85069a688c9ff2984d8f
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qmlstatenodeinstance.cpp

@@ -118,5 +118,21 @@ bool QmlStateNodeInstance::resetStateProperty(const ObjectNodeInstance::Pointer
     return QmlPrivateGate::States::resetStateProperty(object(), target->object(), propertyName, resetValue);
 }
 
+void QmlStateNodeInstance::reparent(const ObjectNodeInstance::Pointer &oldParentInstance,
+                                    const PropertyName &oldParentProperty,
+                                    const ObjectNodeInstance::Pointer &newParentInstance,
+                                    const PropertyName &newParentProperty)
+{
+    ServerNodeInstance oldState = nodeInstanceServer()->activeStateInstance();
+
+    ObjectNodeInstance::reparent(oldParentInstance,
+                                 oldParentProperty,
+                                 newParentInstance,
+                                 newParentProperty);
+
+    if (oldState.isValid())
+        oldState.activateState();
+}
+
 } // namespace Internal
 } // namespace QmlDesigner

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qmlstatenodeinstance.h

@@ -49,6 +49,10 @@ public:
     bool updateStateBinding(const ObjectNodeInstance::Pointer &target, const PropertyName &propertyName, const QString &expression) override;
     bool resetStateProperty(const ObjectNodeInstance::Pointer &target, const PropertyName &propertyName, const QVariant &resetValue) override;
 
+    void reparent(const ObjectNodeInstance::Pointer &oldParentInstance,
+                  const PropertyName &oldParentProperty,
+                  const ObjectNodeInstance::Pointer &newParentInstance,
+                  const PropertyName &newParentProperty) override;
 
 protected:
     QmlStateNodeInstance(QObject *object);