DefaultAppEventService: specify subscription keys

This will ensure that only the highest priority event handlers are
subscribed. Specifically, the LegacyAppEventService will take precedence
over the CoreAppEventService, should both of them be present in the
application context.

Author: ctrueden

src/main/java/org/scijava/platform/DefaultAppEventService.java

@@ -85,20 +85,20 @@ public List<Class<? extends Command>> getCommands() {
 
 	// -- Event handlers --
 
-	@EventHandler
+	@EventHandler(key = "org.scijava.platform.AppEventService#about")
 	protected void onEvent(@SuppressWarnings("unused") final AppAboutEvent event)
 	{
 		about();
 	}
 
-	@EventHandler
+	@EventHandler(key = "org.scijava.platform.AppEventService#prefs")
 	protected void onEvent(
 		@SuppressWarnings("unused") final AppPreferencesEvent event)
 	{
 		prefs();
 	}
 
-	@EventHandler
+	@EventHandler(key = "org.scijava.platform.AppEventService#quit")
 	protected void onEvent(@SuppressWarnings("unused") final AppQuitEvent event) {
 		quit();
 	}