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
MPlaceholder placeholderB2 = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		placeholderB2.setRef(partB);
		partStackB.getChildren().add(placeholderB2);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = window.getContext().get(EPartService.class);
		partService.activate(partA);
		partService.switchPerspective(perspectiveB);
		partService.activate(partB);
		partService.switchPerspective(perspectiveA);
		assertEquals(partA, partService.getActivePart());
		partService.activate(partA);
		assertEquals(partA, partService.getActivePart());
		partService.switchPerspective(perspectiveB);
		assertEquals(partB, partService.getActivePart());
		partService.activate(partC);
		assertEquals(partC, partService.getActivePart());
		partService.switchPerspective(perspectiveA);
		assertEquals(partA, partService.getActivePart());
		partService.hidePart(partB, force);
		assertFalse(placeholderB1.isToBeRendered());
	}
	public void testHidePart_Bug327917_True() {
		testHidePart_Bug327917(true);
	}
	public void testHidePart_Bug327917_False() {
		testHidePart_Bug327917(false);
	}
	private void testHidePart_Bug327964(boolean force) {