Bug 298851 The change on containerData doesn't reflect on UI
During the development of e4 designer on the part layout, we have noticed a problem of synchronizatin of EMF with SWT. The change of containerData via API is not reflected on UI. I suppose it is in working progress.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/SashRenderer.java
public SashRenderer() {
		super();
	}
	@PostConstruct
	void postConstruct() {
		sashEventHandler = new EventHandler() {
			public void handleEvent(Event event) {
				
				Object element = event.getProperty(UIEvents.EventTags.ELEMENT);
				if (!(element instanceof MPartSashContainer)) {
					return;
				}
				if (UIEvents.GenericTile.HORIZONTAL.equals(event
						.getProperty(UIEvents.EventTags.ATTNAME))) {
					Boolean horizontal = (Boolean) event
							.getProperty(UIEvents.EventTags.NEW_VALUE);
					MPartSashContainer container = (MPartSashContainer) element;
					SashForm sashForm = (SashForm) container.getWidget();
					sashForm
							.setOrientation(horizontal.booleanValue() ? SWT.HORIZONTAL
									: SWT.VERTICAL);
				}
			}
		};
		eventBroker.subscribe(UIEvents.buildTopic(UIEvents.GenericTile.TOPIC,
				UIEvents.GenericTile.HORIZONTAL), sashEventHandler);
	}
	@PreDestroy
	void preDestroy() {
		eventBroker.unsubscribe(sashEventHandler);