Bug 303831 Warnings logged when trying to merge changes to an MPart's 'closeable' attribute
Warnings are printed out to syserr. --- WARNING: Unknown feature found, reconciliation may fail: Part#closeable
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/reconciler/ModelReconcilerPartTest.java
MApplication application = createApplication();
		MWindow window = createWindow(application);
		MPart part1 = MApplicationFactory.eINSTANCE.createPart();
		window.getChildren().add(part1);
		MToolBar toolBar = MApplicationFactory.eINSTANCE.createToolBar();
		part1.setToolbar(toolBar);
		saveModel();
		ModelReconciler reconciler = createModelReconciler();
		reconciler.recordChanges(application);
		MPart part2 = MApplicationFactory.eINSTANCE.createPart();
		window.getChildren().add(part2);
		part2.setToolbar(toolBar);
		Object state = reconciler.serialize();
		application = createApplication();
		window = application.getChildren().get(0);
		part1 = (MPart) window.getChildren().get(0);
		toolBar = part1.getToolbar();
		Collection<ModelDelta> deltas = constructDeltas(application, state);
		assertEquals(1, window.getChildren().size());
		assertEquals(part1, window.getChildren().get(0));
		assertEquals(toolBar, part1.getToolbar());
		applyAll(deltas);
		assertEquals(2, window.getChildren().size());
		assertEquals(part1, window.getChildren().get(0));
		assertNull(part1.getToolbar());
		part2 = (MPart) window.getChildren().get(1);
		assertEquals(toolBar, part2.getToolbar());
	}
}