Bug 304074 View toolbars don't go away when the view is closed
1. Run the compatibility layer. 2. Close the 'Package Explorer' view. 3. Its toolbar is still there.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
private static final String FOLDER_DISPOSED = "folderDisposed"; 
	Image viewMenuImage;
	@Inject
	IStylingEngine stylingEngine;
	@Inject
	IEventBroker eventBroker;
	@Inject
	IPresentationEngine renderer;
	private EventHandler itemUpdater;
	private EventHandler dirtyUpdater;
	private boolean ignoreTabSelChanges = false;
	public StackRenderer() {
		super();
	}
	@PostConstruct
	public void init() {
		super.init(eventBroker);
		itemUpdater = new EventHandler() {
			public void handleEvent(Event event) {
				Object objElement = event
						.getProperty(UIEvents.EventTags.ELEMENT);
				
				if (!(objElement instanceof MUILabel)
						|| !(objElement instanceof MUIElement))
					return;
				
				MUIElement uiElement = (MUIElement) objElement;