QmlDesigner: Don't show resize handles for a non resizable item

Change-Id: I02be8d0641b03206a6739c3f8820b2862745df06
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/formeditor/resizeindicator.cpp

@@ -74,6 +74,7 @@ void ResizeIndicator::setItems(const QList<FormEditorItem*> &itemList)
         if (item
                 && item->qmlItemNode().isValid()
                 && item->qmlItemNode().instanceIsResizable()
+                && item->qmlItemNode().modelIsResizable()
                 && !item->qmlItemNode().instanceHasRotationTransform()
                 && !item->qmlItemNode().instanceIsInLayoutable()) {
             ResizeController controller(m_layerItem, item);