Bug 329310 Part service does not autogenerate stacks if the last container is not one
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
MPlaceholder areaPlaceholderB = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		areaPlaceholderB.setRef(area);
		perspectiveB.getChildren().add(areaPlaceholderB);
		perspectiveB.setSelectedElement(areaPlaceholderB);
		initialize(applicationContext, application);
		getEngine().createGui(window1);
		getEngine().createGui(window2);
		EPartService partService = window2.getContext().get(EPartService.class);
		partService.activate(sharedPart);
		partService.switchPerspective(perspectiveB);
		assertEquals(sharedPart, partService.getActivePart());
		partService.hidePart(sharedPart);
		assertNull(partService.getActivePart());
		application.setSelectedElement(window1);
		window1.getContext().activate();
		partService.switchPerspective(perspectiveA);
		assertEquals(window1.getContext(), application.getContext()
				.getActiveChild());
		assertEquals(perspectiveA.getContext(), window2.getContext()
				.getActiveChild());
	}
	/**
	 * Test to ensure that the method annotated with the {@link Focus}
	 * annotation is invoked when switching between perspectives.
	 */
	public void testSwitchPerspective06() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();