QmlDesigner: Add isValidQmlModelStateOperation

Change-Id: I10f4a9dbb2ba8ad25553b6cae10e78162514d85b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/designercore/include/qmlchangeset.h

@@ -44,6 +44,7 @@ public:
     ModelNode target() const;
     void setTarget(const ModelNode &target);
     bool isValid() const;
+    static bool isValidQmlModelStateOperation(const ModelNode &modelNode);
 };
 
 

src/plugins/qmldesigner/designercore/model/qmlchangeset.cpp

@@ -60,9 +60,14 @@ bool QmlPropertyChanges::isValidQmlPropertyChanges(const ModelNode &modelNode)
 
 bool QmlModelStateOperation::isValid() const
 {
-    return QmlModelNodeFacade::isValid() && (
-                modelNode().metaInfo().isSubclassOf("<cpp>.QDeclarative1StateOperation", -1, -1)
-                || modelNode().metaInfo().isSubclassOf("<cpp>.QQuickStateOperation", -1, -1));
+    return isValidQmlModelStateOperation(modelNode());
+}
+
+bool QmlModelStateOperation::isValidQmlModelStateOperation(const ModelNode &modelNode)
+{
+    return isValidQmlModelNodeFacade(modelNode)
+            && (modelNode.metaInfo().isSubclassOf("<cpp>.QDeclarative1StateOperation", -1, -1)
+                || modelNode.metaInfo().isSubclassOf("<cpp>.QQuickStateOperation", -1, -1));
 }
 
 void QmlPropertyChanges::removeProperty(const PropertyName &name)