calling `stop_propagation()` on immutable events

[aevyrie]

calling `stop_propagation()` on immutable events

[aevyrie]

I think this was just an oversight, I'll make this change and publish a new version.

[aevyrie]

FYI, you can make an extension trait if you want to make a grab-bag of reusable listener builders.

trait MyListeners {
    fn listener_remove_and_stop<B: Bundle>() -> Self;
}

impl<E: EntityEvent> MyListeners for On<E> {
    fn listener_remove_and_stop <B: Bundle>() -> Self {
        Self::run(|mut event: ResMut<ListenerInput<E>>, mut commands: Commands| {
            event.stop_propagation();
            commands.entity(event.listener()).remove::<B>();
        })
    }
}

Then, as long as your extension trait is in scope, you can call your methods as if they were defined in this library:

use MyListeners;  // Gives access to our listener_remove_and_stop function
commands.spawn(On::<Eat>::listener_remove_and_stop::<Food>())

Not sure if you are aware of this pattern, though others running across this ticket might find it handy.