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
detachedWindow.setSelectedElement(partB);
		MPart partC = BasicFactoryImpl.eINSTANCE.createPart();
		detachedWindow.getChildren().add(partC);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = window.getContext().get(EPartService.class);
		partService.activate(partA);
		partService.activate(partB);
		partService.activate(partC);
		partService.activate(partA);
		partService.activate(partB);
		partService.hidePart(partB);
		assertEquals(partA, partService.getActivePart());
	}
	public void testHidePart_ActivationHistory_Bug327952_02() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setSelectedElement(window);
		MWindow detachedWindow = BasicFactoryImpl.eINSTANCE.createWindow();
		window.getWindows().add(detachedWindow);
		MPart partA = BasicFactoryImpl.eINSTANCE.createPart();
		window.getChildren().add(partA);
		window.setSelectedElement(partA);
		MPart partB = BasicFactoryImpl.eINSTANCE.createPart();
		detachedWindow.getChildren().add(partB);
		detachedWindow.setSelectedElement(partB);
		initialize(applicationContext, application);
		getEngine().createGui(window);