swap event buffers in FixedUpdate

Author: maniwani

crates/bevy_app/src/app.rs

@@ -1,4 +1,4 @@
-use crate::{First, Main, MainSchedulePlugin, Plugin, Plugins, StateTransition};
+use crate::{FixedUpdate, Main, MainSchedulePlugin, Plugin, Plugins, StateTransition};
 pub use bevy_derive::AppLabel;
 use bevy_ecs::{
     prelude::*,
@@ -486,7 +486,7 @@ impl App {
     {
         if !self.world.contains_resource::<Events<T>>() {
             self.init_resource::<Events<T>>().add_systems(
-                First,
+                FixedUpdate,
                 bevy_ecs::event::event_update_system::<T>
                     .run_if(bevy_ecs::event::event_update_condition::<T>),
             );

crates/bevy_ecs/src/event.rs

@@ -749,7 +749,7 @@ impl<'a, E: Event> ExactSizeIterator for EventIteratorWithId<'a, E> {
     }
 }
 
-/// A system that calls [`Events::update`] once per frame.
+/// A system that calls [`Events::update`].
 pub fn event_update_system<T: Event>(mut events: ResMut<Events<T>>) {
     events.update();
 }