QmlDesigner.PropertyEditor: Add Q_DISABLE_COPY to PropertyEditorQmlBackend

Change-Id: Ib9af721d195291886a78fc300e24691827f56ade
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/components/propertyeditor/propertyeditorqmlbackend.h

@@ -46,7 +46,12 @@ namespace QmlDesigner {
 class PropertyEditorTransaction;
 class PropertyEditorView;
 
-class PropertyEditorQmlBackend {
+class PropertyEditorQmlBackend
+{
+
+    Q_DISABLE_COPY(PropertyEditorQmlBackend)
+
+
 public:
     PropertyEditorQmlBackend(PropertyEditorView *propertyEditor);
     ~PropertyEditorQmlBackend();