Bug 316558 [XMI] Changes to a window's main menu is not being persisted properly
Additions to an MWindow's main menu is not being persisted correctly.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/reconciler/ModelReconcilerWindowTest.java
public void testWindow_X() {
		MApplication application = createApplication();
		MWindow window = createWindow(application);
		window.setX(100);
		saveModel();
		ModelReconciler reconciler = createModelReconciler();
		reconciler.recordChanges(application);
		window.setX(200);
		Object state = reconciler.serialize();
		application = createApplication();
		window = application.getChildren().get(0);
		Collection<ModelDelta> deltas = constructDeltas(application, state);
		assertEquals(100, window.getX());
		applyAll(deltas);
		assertEquals(200, window.getX());
	}
	public void testWindow_Y() {
		MApplication application = createApplication();
		MWindow window = createWindow(application);
		window.setY(100);
		saveModel();
		ModelReconciler reconciler = createModelReconciler();
		reconciler.recordChanges(application);
		window.setY(200);