Bug 329184 Detached view that is an activation target candidate can prevent perspective switching
1. Detach the 'Outline' view. 2. Window > Open Perspective > Debug 3. Window > Open Perspective > Java 4. The perspective switch doesn't actually happen. You see the 'Debug' perspective's content with an 'Outline' view detached. Closing the 'Outline' view in the 'Debug' perspective will workaround this problem.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
getEngine().createGui(window);
		ClientEditor editor = (ClientEditor) saveablePart.getObject();
		editor.setThrowException(throwException);
		
		applicationContext.set(ISaveHandler.class.getName(), null);
		EPartService partService = (EPartService) window.getContext().get(
				EPartService.class.getName());
		if (beforeDirty) {
			assertEquals(!throwException, partService.saveAll(confirm));
		} else {
			assertTrue(
					"The part is not dirty, the save operation should have complete successfully",
					partService.saveAll(confirm));
		}
		assertEquals(beforeDirty && throwException, saveablePart.isDirty());
		assertEquals(beforeDirty, editor.wasSaveCalled());
	}
	public void testSaveAll_NoHandler_TTT() {
		testSaveAll_NoHandler(true, true, true);
	}
	public void testSaveAll_NoHandler_TTF() {
		testSaveAll_NoHandler(true, true, false);
	}
	public void testSaveAll_NoHandler_TFT() {
		testSaveAll_NoHandler(true, false, true);
	}
	public void testSaveAll_NoHandler_TFF() {
		testSaveAll_NoHandler(true, false, false);
	}
	public void testSaveAll_NoHandler_FTT() {