BevyRenet: add emit_server_events_system for RenetServerPlugin

We now emit server events on its own system.
Now, transports can update and disconnect clients before events are emitted.

Should fix some 1 frame disconnect/connect delays.

bevy_renet/src/lib.rs

@@ -36,13 +36,21 @@ impl Plugin for RenetServerPlugin {
     fn build(&self, app: &mut App) {
         app.init_resource::<Events<ServerEvent>>();
         app.add_systems(PreUpdate, Self::update_system.run_if(resource_exists::<RenetServer>()));
+        app.add_systems(
+            PreUpdate,
+            Self::emit_server_events_system
+                .run_if(resource_exists::<RenetServer>())
+                .after(Self::update_system),
+        );
     }
 }
 
 impl RenetServerPlugin {
-    pub fn update_system(mut server: ResMut<RenetServer>, time: Res<Time>, mut server_events: EventWriter<ServerEvent>) {
+    pub fn update_system(mut server: ResMut<RenetServer>, time: Res<Time>) {
         server.update(time.delta());
+    }
 
+    pub fn emit_server_events_system(mut server: ResMut<RenetServer>, mut server_events: EventWriter<ServerEvent>) {
         while let Some(event) = server.get_event() {
             server_events.send(event);
         }

bevy_renet/src/steam.rs

@@ -26,7 +26,8 @@ impl Plugin for SteamServerPlugin {
             Self::update_system
                 .in_set(RenetReceive)
                 .run_if(resource_exists::<RenetServer>())
-                .after(RenetServerPlugin::update_system),
+                .after(RenetServerPlugin::update_system)
+                .before(RenetServerPlugin::emit_server_events_system),
         );
 
         app.add_systems(

bevy_renet/src/transport.rs

@@ -21,7 +21,8 @@ impl Plugin for NetcodeServerPlugin {
                 .in_set(RenetReceive)
                 .run_if(resource_exists::<NetcodeServerTransport>())
                 .run_if(resource_exists::<RenetServer>())
-                .after(RenetServerPlugin::update_system),
+                .after(RenetServerPlugin::update_system)
+                .before(RenetServerPlugin::emit_server_events_system),
         );
 
         app.add_systems(