Bug 343003 Selection changes for shared parts may not be propagated if they were not originally rendered in the model
The search algorithm currently only iterates through containers for parts. This will not work for parts that are represented by placeholders.
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/ui/internal/workbench/SelectionServiceImpl.java
void preDestroy() {
		genericListeners.clear();
		targetedListeners.clear();
		eventBroker.unsubscribe(eventHandler);
	}
	@PostConstruct
	void postConstruct() {
		eventBroker
				.subscribe(UIEvents.buildTopic(UIEvents.Context.TOPIC, UIEvents.Context.CONTEXT),
						eventHandler);
		for (MPart part : partService.getParts()) {
			track(part);
		}
	}
	@Inject
	void setPart(@Optional @Named(IServiceConstants.ACTIVE_PART) final MPart part) {
		if ((part != null) && (activePart != part)) {
			activePart = part;
			IEclipseContext partContext = part.getContext();
			
			if (partContext.containsKey(OUT_SELECTION)) {
				Object selection = partContext.get(OUT_SELECTION);
				notifyListeners(part, selection);
			}
			track(part);
		}
	}
	private boolean isInContainer(MPart part) {
		return isInContainer((MElementContainer<?>) serviceRoot, part);
	}