Entity-bound sounds follow the dragon itself; ledger rows for #9382

A sound bound to the Ender Dragon read the copy spawn_entity keeps in mobs,
which move_entity never moves, so it stayed at the spawn point. The live
dragon's position goes first now. The port ledger listed
EntityBoundSoundInstance.tick as missing although #9382 ported it.
From martipops's review of #9382.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/horizon-client/src/game/remote.rs

@@ -790,8 +790,14 @@ impl Game<'_> {
         let mut state = entity_sound_state(id, player, &self.mobs, &r.entities)?;
         // Vehicles, projectiles and other simulated objects may have moved since
         // the last tracking packet, just as the mob interpolation has.
-        if let Some(position) = self
-            .level_entity(id)
+        // The dragon: `spawn_entity` keeps a copy of it in `mobs` that `move_entity` leaves where it
+        // spawned, so its own state goes first.
+        let dragon = u32::try_from(id)
+            .ok()
+            .filter(|id| self.dragon.as_ref().is_some_and(|d| d.id == *id))
+            .map(super::commands::Target::Dragon);
+        if let Some(position) = dragon
+            .or_else(|| self.level_entity(id))
             .and_then(|target| self.target_position(target))
         {
             state.position = position;

tools/port_map/client-002.tsv

@@ -77,7 +77,7 @@ ClientPacketListener.applyPlayerInfoUpdate	inline	crates/horizon-client/src/game
 ClientPacketListener.initializeChatSession	port	crates/horizon-client/src/game/remote.rs::Remote::new_chat_validator	the session each INITIALIZE_CHAT entry carries is kept and checked against the services' profile-key keys when the player's chat is first read
 ClientPacketListener.enforcesSecureChat	inline	crates/horizon-client/src/game/remote.rs::Game::handle_packet	the Login flag is kept as serverEnforcesSecureChat and the fallback message validator enforces it
 ClientPacketListener.handleGameRuleValues	port	crates/horizon-client/src/game/lan_screen.rs::Game::remote_world_options_rules	
-ClientPacketListener.handleSoundEntityEvent	port	crates/horizon-client/src/game/remote.rs::Game::handle_packet	SoundEntity arm: the sound plays where the tracked entity is
+ClientPacketListener.handleSoundEntityEvent	port	crates/horizon-client/src/game/remote.rs::Game::handle_packet	SoundEntity arm: an EntityBoundSoundInstance that starts where the entity is and follows it (SoundInstance::tick)
 ClientPacketListener.handleAddObjective	port	crates/horizon-client/src/game/remote.rs::Game::remote_objective	add, remove and update of an objective
 ClientPacketListener.handleSetScore	port	crates/horizon-client/src/game/remote.rs::Game::handle_packet	SetScore arm
 ClientPacketListener.handleResetScore	port	crates/horizon-client/src/game/remote.rs::Game::handle_packet	ResetScore arm

tools/port_map/client2-008.tsv

@@ -140,7 +140,7 @@ AbstractSoundInstance.getOrResolve	port	crates/horizon-client-render/src/sound_e
 BeeSoundInstance.tick	port	crates/horizon-client-render/src/sound_engine.rs::SoundInstance::tick	Ticking::Bee follows the bee; pitch and volume from speed
 DirectionalSoundInstance.setPosition	port	crates/horizon-client/src/game/end.rs::Game::tick_end	gap: minor: the end flash plays without a position, so the 10-block offset toward the view is not kept
 ElytraOnPlayerSoundInstance.tick	port	crates/horizon-client-render/src/sound_engine.rs::SoundInstance::tick	the `Elytra` arm: `item.elytra.flying` follows the player each tick, stops 20 ticks after gliding ends, volume `speed / 4` clamped, silent for a second then fading in over the next
-EntityBoundSoundInstance.tick	missing		minor: a sound tied to an entity does not follow it; it stays at its start point
+EntityBoundSoundInstance.tick	port	crates/horizon-client-render/src/sound_engine.rs::SoundInstance::tick	the `EntityBound` arm: follows the entity each tick (Game::remote_sound_entity_state), stops when it is removed or silent, returning before it moves as vanilla does
 RidingEntitySoundInstance.tick	port	crates/horizon-client-render/src/sound_engine.rs::SoundInstance::tick	the `RidingEntity` arm for `entity.happy_ghast.riding` and `entity.nautilus.riding`: stops when the ridden mob is gone or silent, volume 0 unless the underwater test matches and the speed is at least 0.01, else the clamped lerp
 RidingMinecartSoundInstance.shoudlPlaySound	port	crates/horizon-client-render/src/sound_engine.rs::SoundInstance::tick	RidingMinecart arm; the predicate is always true for OldMinecartBehavior, Horizon's only minecart
 SnifferSoundInstance.tick	port	crates/horizon-client/src/game/sniffers.rs::Game::tick_sniffer_effects	gap: player: the digging sound plays once when digging starts; vanilla loops it while digging