Bug 294750 [Contributions] Allow a handler to update MUIItems
A handler for a command should be able to update text or tooltips on UIItems that point to the command. ex: in 3.x we have this pattern. 1) each item registers as a UIElement for a command 2) the command service can handle a request to refresh all UIElements for a command 3) changing handlers causes a refresh request 4) the client code can also request a refresh We need a similar story for e4 that would allow the active handler to update the appropriate items. It is a little more complicated in e4 as depending on your location (part of the hierarchy you are requesting from) you will potentially have different handlers applicable to different MUIItems. PW
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/MenuItemRenderer.java
@Inject
	Logger logger;
	@Inject
	IEventBroker eventBroker;
	private EventHandler itemUpdater = new EventHandler() {
		public void handleEvent(Event event) {
			
			if (!(event.getProperty(UIEvents.EventTags.ELEMENT) instanceof MMenuItem))
				return;
			MMenuItem itemModel = (MMenuItem) event
					.getProperty(UIEvents.EventTags.ELEMENT);
			MenuItem menuItem = (MenuItem) itemModel.getWidget();
			
			if (menuItem == null)
				return;
			String attName = (String) event
					.getProperty(UIEvents.EventTags.ATTNAME);