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
MPartStack partStack = BasicFactoryImpl.eINSTANCE.createPartStack();
		window.getChildren().add(partStack);
		window.setSelectedElement(partStack);
		MPart partA = BasicFactoryImpl.eINSTANCE.createPart();
		partStack.getChildren().add(partA);
		partStack.setSelectedElement(partA);
		MPart partB = BasicFactoryImpl.eINSTANCE.createPart();
		partStack.getChildren().add(partB);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = (EPartService) window.getContext().get(
				EPartService.class.getName());
		
		partStack.getChildren().remove(partA);
		
		partService.showPart(partB, partState);
		assertEquals(partB, partStack.getSelectedElement());
	}
	public void testShowPart_Bug328078_CREATE() {
		testShowPart_Bug328078(PartState.CREATE);
	}
	public void testShowPart_Bug328078_VISIBLE() {
		testShowPart_Bug328078(PartState.VISIBLE);
	}
	public void testShowPart_Bug328078_ACTIVATE() {
		testShowPart_Bug328078(PartState.ACTIVATE);
	}
	private void testHidePart_Bug325148(boolean force) {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();