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
if (element.getTags().contains("newtablook")) { 
			ctf.setRenderer(new CTabRendering(ctf));
		}
		bindWidget(element, ctf);
		
		
		ctf.setUnselectedCloseVisible(false);
		newWidget = ctf;
		final IEclipseContext folderContext = getContext(element);
		folderContext.set(FOLDER_DISPOSED, Boolean.FALSE);
		final IEclipseContext toplevelContext = getToplevelContext(element);
		final Trackable updateActiveTab = new Trackable(folderContext) {
			public boolean notify(ContextChangeEvent event) {
				if (event.getEventType() == ContextChangeEvent.DISPOSE)
					return false;
				if (!participating) {
					return true;
				}
				trackingContext.get(FOLDER_DISPOSED);
				IEclipseContext currentActive = toplevelContext;
				IEclipseContext child;
				while (currentActive != trackingContext
						&& (child = (IEclipseContext) currentActive
								.get("activeChild")) != null && child != currentActive) { 
					currentActive = child;
				}
				
				String cssClassName = (currentActive == trackingContext) ? "active" 
						: "inactive"; 
				stylingEngine.setClassname(ctf, cssClassName);