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.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/PartRenderingEngineTests.java
container.getChildren().remove(partA);
		assertTrue(
				"Changing the parent of the selected element should have set the field to null",
				container.getSelectedElement() == null);
	}
	public void testCreateGuiBug301950() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		final MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setContext(appContext);
		appContext.set(MApplication.class.getName(), application);
		wb = new E4Workbench(application, appContext);
		wb.createAndRunUI(window);
		MPart part = BasicFactoryImpl.eINSTANCE.createPart();
		part.setContributionURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");
		window.getChildren().add(part);
		IPresentationEngine renderer = (IPresentationEngine) appContext
				.get(IPresentationEngine.class.getName());
		renderer.createGui(part);
		renderer.removeGui(part);
		while (Display.getCurrent().readAndDispatch()) {
			
		}
	}
	public void testRemoveGuiBug307578() {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		final MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);