Bug 329482 Uninstantiated part may be rendered when closing another part in the same stack
1. Activate the 'Javadoc' view. 2. Activate the 'Package Explorer' view. 3. Shutdown. 4. Restart. 5. Ctrl+3 > Properties 6. Hide the 'Properties' view. 7. Now the 'Problems' view is the selected element. It should be the 'Javadoc' view.
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();