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
stack.getChildren().add(partA);
		stack.getChildren().add(partB);
		stack.setSelectedElement(partA);
		initialize(applicationContext, application);
		getEngine().createGui(windowA);
		getEngine().createGui(windowB);
		EPartService partServiceA = (EPartService) windowA.getContext().get(
				EPartService.class.getName());
		EPartService partServiceB = (EPartService) windowB.getContext().get(
				EPartService.class.getName());
		PartListener partListener = new PartListener();
		partServiceA.addPartListener(partListener);
		partServiceB.activate(partB);
		assertEquals(0, partListener.getDeactivated());
		assertEquals(0, partListener.getDeactivatedParts().size());
		assertTrue(partListener.isValid());
		partListener.clear();
		partServiceB.activate(partA);
		assertEquals(0, partListener.getDeactivated());
		assertEquals(0, partListener.getDeactivatedParts().size());
		assertTrue(partListener.isValid());
	}
	public void testEvent_PartHidden() {
		MApplication application = createApplication("partFront", "partBack");
		MWindow window = application.getChildren().get(0);
		MPartStack partStack = (MPartStack) window.getChildren().get(0);
		MPart partFront = (MPart) partStack.getChildren().get(0);
		MPart partBack = (MPart) partStack.getChildren().get(1);
		partStack.setSelectedElement(partFront);
		getEngine().createGui(window);