QmlDesigner: Add rect to invalid ids

Change-Id: Ie80552dbe85d4658711b3906f1b3819cf7a4f8ba
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

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

@@ -197,7 +197,8 @@ static bool isIdToAvoid(const QString& id)
         "shaderInfo",
         "sprite",
         "spriteSequence",
-        "baseState"
+        "baseState",
+        "rect"
     };
 
     return ids.contains(id);