QuickDesigner: Add debugging output to track State Switching

Of course disabled by default

Reviewed-by: Christiaan Janssen

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

@@ -43,6 +43,10 @@ enum {
     debug = false
 };
 
+enum {
+    debug = false
+};
+
 namespace QmlDesigner {
 
 QmlModelView::QmlModelView(QObject *parent)