eventbus: V ui on_key_down fix

vlib/eventbus/eventbus.v

@@ -47,13 +47,13 @@ pub fn new[T]() &EventBus[T] {
 	return &EventBus[T]{registry, &Publisher[T]{registry}, &Subscriber[T]{registry}}
 }
 
-// publish publish an event with provided Params & name.
+// publish publishes an event with provided Params & name.
 pub fn (eb &EventBus[T]) publish(name T, sender voidptr, args voidptr) {
 	mut publisher := eb.publisher
 	publisher.publish(name, sender, args)
 }
 
-// clear_all clear all subscribers.
+// clear_all clears all subscribers.
 pub fn (eb &EventBus[T]) clear_all() {
 	mut publisher := eb.publisher
 	publisher.clear_all()
@@ -66,9 +66,22 @@ pub fn (eb &EventBus[T]) has_subscriber(name T) bool {
 
 // publish publish an event with provided Params & name.
 fn (mut pb Publisher[T]) publish(name T, sender voidptr, args voidptr) {
-	for event in pb.registry.events {
+	// println('Publisher.publish(name=${name} sender=${sender} args=${args})')
+	mut handled_receivers := [20]voidptr{} // handle duplicate bugs TODO fix properly + perf
+	// is_key_down := name == 'on_key_down'
+	mut j := 0
+	for i, event in pb.registry.events {
 		if event.name == name {
+			// if is_key_down {
+			if event.receiver in handled_receivers {
+				continue
+			}
+			//}
+			// println('got ${i + 1} name=${name} event.receiver=${event.receiver}')
 			event.handler(event.receiver, args, sender)
+			// handled_receivers << event.receiver
+			handled_receivers[j] = event.receiver
+			j++
 		}
 	}
 	pb.registry.events = pb.registry.events.filter(!(it.name == name && it.once))