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Fixes #13758. # Objective Calling `update` on the main app already calls `clear_trackers`. Calling it again in `SubApps::update` caused RemovedCompenet Events to be cleared earlier than they should be. ## Solution - Don't call clear_trackers an extra time. ## Testing I manually tested the fix with this unit test: ``` #[cfg(test)] mod test { use crate::core::{FrameCount, FrameCountPlugin}; use crate::prelude::*; #[test] fn test_next_frame_removal() { #[derive(Component)] struct Foo; #[derive(Resource)] struct RemovedCount(usize); let mut app = App::new(); app.add_plugins(FrameCountPlugin); app.add_systems(Startup, |mut commands: Commands| { for _ in 0..100 { commands.spawn(Foo); } commands.insert_resource(RemovedCount(0)); }); app.add_systems(First, |counter: Res<FrameCount>| { println!("Frame {}:", counter.0) }); fn detector_system( mut removals: RemovedComponents<Foo>, foos: Query<Entity, With<Foo>>, mut removed_c: ResMut<RemovedCount>, ) { for e in removals.read() { println!(" Detected removed Foo component for {e:?}"); removed_c.0 += 1; } let c = foos.iter().count(); println!(" Total Foos: {}", c); assert_eq!(c + removed_c.0, 100); } fn deleter_system(foos: Query<Entity, With<Foo>>, mut commands: Commands) { foos.iter().next().map(|e| { commands.entity(e).remove::<Foo>(); }); } app.add_systems(Update, (detector_system, deleter_system).chain()); app.update(); app.update(); app.update(); app.update(); } } ``` |
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