Bug 328339 Part activation history seems to ignore detached windows
1. Detach a view. 2. Drag another view into said detached window. 3. Activate the two views alternatively. 4. Close one of them. 5. A part in the workbench window is activated instead of the other view in the detached window.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
MPart partB = BasicFactoryImpl.eINSTANCE.createPart();
		partB.setElementId("partB");
		partB.setToBeRendered(false);
		partStack.getChildren().add(partB);
		partStack.setSelectedElement(partA);
		window.setSelectedElement(partStack);
		application.setSelectedElement(window);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = (EPartService) window.getContext().get(
				EPartService.class.getName());
		partService.activate(partA);
		assertEquals(partA, partService.getActivePart());
		MPart shownPart = partService.showPart("partB",
				EPartService.PartState.VISIBLE);
		assertEquals(2, partStack.getChildren().size());
		assertEquals(
				"The part is in the same stack as the active part, so the active part should not have changed",
				partA, partService.getActivePart());
		assertNotNull("The shown part should have a context",
				partB.getContext());
		assertTrue(partService.isPartVisible(partA));
		assertFalse(partService.isPartVisible(partB));
		assertEquals(partB, shownPart);
		assertTrue(partB.isToBeRendered());
	}
	private void testShowPart_Id_Unrendered(EPartService.PartState partState) {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();