QmlDesigner.MetaInfo: Do not convert Enumeration

This is a designer specific type that is never converted.

Change-Id: Ibfe73bdb441cbd17ec728025b9c8bf77d3df2587
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/designercore/metainfo/nodemetainfo.cpp

@@ -31,6 +31,7 @@
 #include "model.h"
 
 #include "metainfo.h"
+#include <enumeration.h>
 #include <rewriterview.h>
 #include <propertyparser.h>
 
@@ -1358,7 +1359,8 @@ QVariant NodeMetaInfo::propertyCastedValue(const PropertyName &propertyName, con
 
     const QVariant variant = value;
     QVariant copyVariant = variant;
-    if (propertyIsEnumType(propertyName))
+    if (propertyIsEnumType(propertyName)
+            || variant.canConvert<Enumeration>())
         return variant;
 
     const QString typeName = propertyTypeName(propertyName);