Bug 336225 Trim bars do not get unrendered by the rendering engine when trimmed window is unrendered
The trim bars are "ignored" by the rendering engine as it does not perform an unrendering pass on them when the parent trimmed window is being unrendered.
bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java
return curFactory.getRenderer(uiElement, parent);
	}
	protected AbstractPartRenderer getRendererFor(MUIElement element) {
		return (AbstractPartRenderer) element.getRenderer();
	}
	public Object run(final MApplicationElement uiRoot,
			final IEclipseContext runContext) {
		final Display display;
		if (runContext.get(Display.class) != null) {
			display = runContext.get(Display.class);
		} else {
			display = Display.getDefault();
			runContext.set(Display.class, display);
		}
		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
			public void run() {
				initializeStyling(display, runContext);
				
				runContext.set(IResourceUtilities.class.getName(),
						new ResourceUtility());
				
				KeyBindingDispatcher dispatcher = (KeyBindingDispatcher) ContextInjectionFactory
						.make(KeyBindingDispatcher.class, runContext);
				runContext.set(KeyBindingDispatcher.class.getName(), dispatcher);
				keyListener = dispatcher.getKeyDownFilter();
				display.addFilter(SWT.KeyDown, keyListener);
				display.addFilter(SWT.Traverse, keyListener);