⬆️ version to v0.3.41 — async queue sync refactoring

- Add `SyncCancelled` error variant for non-fatal cancellations
- Refactor queue sync to async via `MusicQueue::schedule_sync()`
  - Extract browse+conversion into internal helper
- Update all `QueueBackend::sync_queue()` signatures to accept cancel token and on_ready callback  
- Implement early-start logic (on pivot preservation or first insert)
 - Add `QueueReadyToPlay` and  ‘ QueueSyncCancelled➔ SSE events
- Replace blocking `refresh_attached_queue_for()` with non-blocking async dispatch in control_point.rs  
- Bump version to v0.3.41

Blackboard/Todo/enorme_playlist_step3.md

@@ -0,0 +1,642 @@
+** Ce travail devra être réalisé en suivant scrupuleusement les consignes listées dans le fichier [@Rules_optimal.md](file:///Users/coissac/Sync/maison/Petite_maisons/src/pmomusic/Blackboard/Rules_optimal.md) **
+
+# Async Queue Refresh — Étape 3
+
+**Contexte**: `refresh_attached_queue_for()` dans `control_point.rs` est appelé de 3 endroits
+et bloque son thread pendant toute la synchronisation (browse media server + 100+ opérations
+SOAP/mémoire). L'objectif est de factoriser le mécanisme async au niveau de la couche queue
+(`MusicQueue`), qui est déjà l'abstraction agnostique du backend. `control_point.rs` ne doit
+plus connaître les threads ni les tokens d'annulation.
+
+**Principe architectural**: la couche queue sait *comment* syncer (mémoire ou SOAP) et donc
+aussi *comment* annuler et *quand* signaler que la lecture peut démarrer. `control_point.rs`
+sait seulement *quoi* syncer (browse + conversion PlaybackItem). Les deux responsabilités
+restent séparées.
+
+---
+
+## Vue d'ensemble des changements
+
+```
+AVANT
+  control_point.rs
+    refresh_attached_queue_for()
+      → browse()
+      → sync_queue(items)   ← bloquant 1-5s
+
+APRÈS
+  control_point.rs
+    do_queue_refresh_work()  ← interne, fait le browse + conversion
+  MusicQueue (couche queue)
+    schedule_sync(items, callbacks)  ← non-bloquant, retourne immédiatement
+      → thread "queue-sync-{renderer_id}"
+           → QueueBackend::sync_queue(items, cancel_token, on_ready)
+```
+
+---
+
+## Fichiers à modifier / créer
+
+| Fichier | Action |
+|---------|--------|
+| `pmocontrol/src/errors.rs` | Ajouter variante `SyncCancelled` |
+| `pmocontrol/src/queue/backend.rs` | Modifier signature `sync_queue()` |
+| `pmocontrol/src/queue/interne.rs` | Adapter signature `sync_queue()` |
+| `pmocontrol/src/queue/openhome.rs` | Adapter + points de vérification cancel + on_ready |
+| `pmocontrol/src/queue/music_queue.rs` | Ajouter champs async + méthode `schedule_sync()` |
+| `pmocontrol/src/queue/mod.rs` | Exporter `SyncScheduleOutcome` |
+| `pmocontrol/src/model.rs` | Ajouter événements `QueueReadyToPlay`, `QueueSyncCancelled` |
+| `pmocontrol/src/sse.rs` | Sérialiser les deux nouveaux événements |
+| `pmocontrol/src/control_point.rs` | Remplacer les 3 call sites bloquants |
+
+---
+
+## Étape 1 — Nouvelle variante d'erreur (`errors.rs`)
+
+**Fichier**: `pmocontrol/src/errors.rs`
+
+Ajouter après la ligne 51 (`ControlPoint`) :
+
+```rust
+#[error("Queue sync cancelled (superseded by a newer request)")]
+SyncCancelled,
+```
+
+Cette variante est retournée par `sync_queue()` quand le `cancel_token` passe à `true`.
+Elle est **non-fatale** — le coordinator la traite comme un comportement normal, pas une
+erreur à logger en `warn!`.
+
+---
+
+## Étape 2 — Modifier la signature de `sync_queue()` dans le trait (`backend.rs`)
+
+**Fichier**: `pmocontrol/src/queue/backend.rs`, ligne 110
+
+```rust
+// AVANT
+fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError>;
+
+// APRÈS
+use std::sync::{Arc, atomic::AtomicBool};
+
+fn sync_queue(
+    &mut self,
+    items: Vec<PlaybackItem>,
+    cancel_token: &Arc<AtomicBool>,
+    on_ready: Option<Box<dyn FnOnce() + Send>>,
+) -> Result<(), ControlPointError>;
+```
+
+**Sémantique des paramètres** :
+- `cancel_token` : si `true` au moment d'une opération, retourner `Err(SyncCancelled)` immédiatement
+- `on_ready` : callback one-shot appelé quand la lecture peut démarrer (voir logique ci-dessous)
+
+---
+
+## Étape 3 — Adapter `InternalQueue::sync_queue()` (`interne.rs`)
+
+**Fichier**: `pmocontrol/src/queue/interne.rs`
+
+Trouver la méthode `sync_queue()` et adapter la signature. Le corps reste identique,
+avec deux ajouts :
+
+**1. Vérification du pivot (early start)** : si une piste est en cours de lecture
+(un `current_index` est défini dans le snapshot courant), appeler `on_ready` immédiatement
+avant toute opération — la piste courante sera préservée.
+
+**2. Si pas de pivot** (queue vide ou aucune piste en cours) : appeler `on_ready` après
+avoir inséré le premier item.
+
+**3. Vérification cancel** : après chaque item inséré/supprimé (en pratique `InternalQueue`
+est rapide mais le principe doit être cohérent) :
+
+```rust
+fn sync_queue(
+    &mut self,
+    items: Vec<PlaybackItem>,
+    cancel_token: &Arc<AtomicBool>,
+    mut on_ready: Option<Box<dyn FnOnce() + Send>>,
+) -> Result<(), ControlPointError> {
+    use std::sync::atomic::Ordering::SeqCst;
+
+    // Early start si pivot présent
+    let has_current = self.current_index()?.is_some();
+    if has_current {
+        if let Some(f) = on_ready.take() { f(); }
+    }
+
+    // ... logique existante de sync_queue() ...
+    // Dans la boucle d'insertions, après le 1er insert :
+    if on_ready.is_some() {
+        if let Some(f) = on_ready.take() { f(); }
+    }
+    // Après chaque opération :
+    if cancel_token.load(SeqCst) {
+        return Err(ControlPointError::SyncCancelled);
+    }
+
+    Ok(())
+}
+```
+
+---
+
+## Étape 4 — Adapter `OpenHomeQueue::sync_queue()` (`openhome.rs`)
+
+**Fichier**: `pmocontrol/src/queue/openhome.rs`
+
+### 4.1 Signature (ligne ~1277)
+
+```rust
+fn sync_queue(
+    &mut self,
+    items: Vec<PlaybackItem>,
+    cancel_token: &Arc<AtomicBool>,
+    mut on_ready: Option<Box<dyn FnOnce() + Send>>,
+) -> Result<(), ControlPointError>
+```
+
+### 4.2 Early start — logique pivot
+
+Au début de `sync_queue()`, **avant** toute opération SOAP, détecter si un pivot est présent :
+
+```rust
+// Après la récupération du snapshot (ligne ~1323), avant les branches if/else :
+let has_pivot = playing_info.is_some();
+if has_pivot {
+    // Le pivot sera préservé — on peut démarrer la lecture immédiatement
+    if let Some(f) = on_ready.take() { f(); }
+}
+```
+
+Si pas de pivot (nouvelle playlist via `delete_all` + inserts depuis 0) : appeler `on_ready`
+après le **1er insert réussi** dans `replace_queue()` et dans `replace_queue_standard_lcs()`.
+
+### 4.3 Points de vérification cancel
+
+Ajouter `if cancel_token.load(SeqCst) { return Err(SyncCancelled); }` aux endroits suivants :
+
+- Dans `delete_marked_items()` (ligne ~458) : après chaque `delete_id_if_exists()`
+- Dans `rebuild_playlist_section()` (ligne ~494) : après chaque `insert()`
+- Dans `replace_queue_preserve_current()` (ligne ~419) : après chaque `delete_id_if_exists()` et `insert()`
+- Dans `replace_queue_standard_lcs()` (ligne ~693-745) : après chaque delete et insert
+- Dans `replace_queue()` (ligne ~1118) : après chaque insert dans la boucle
+- Dans le fast path `AppendOnly` (ligne ~1318) : après chaque insert
+- Dans le fast path `DeleteFromEnd` (ligne ~1336) : après chaque delete
+
+### 4.4 Propagation du cancel_token aux helpers
+
+Les méthodes helper privées qui font des boucles doivent recevoir le token :
+
+```rust
+fn delete_marked_items(
+    &mut self,
+    old_ids: &[u32],
+    keep_flags: &[bool],
+    position_label: &str,
+    cancel_token: &Arc<AtomicBool>,
+) -> Result<(), ControlPointError>
+
+fn rebuild_playlist_section(
+    &mut self,
+    // ... params existants ...
+    cancel_token: &Arc<AtomicBool>,
+    on_ready: &mut Option<Box<dyn FnOnce() + Send>>,
+) -> Result<u32, ControlPointError>
+```
+
+---
+
+## Étape 5 — Adapter `MusicQueue` (dispatch enum) (`music_queue.rs`)
+
+**Fichier**: `pmocontrol/src/queue/music_queue.rs`
+
+### 5.1 Adapter le dispatch `sync_queue()` (ligne ~98)
+
+```rust
+fn sync_queue(
+    &mut self,
+    items: Vec<PlaybackItem>,
+    cancel_token: &Arc<AtomicBool>,
+    on_ready: Option<Box<dyn FnOnce() + Send>>,
+) -> Result<(), ControlPointError> {
+    match self {
+        MusicQueue::Internal(q) => q.sync_queue(items, cancel_token, on_ready),
+        MusicQueue::OpenHome(q) => q.sync_queue(items, cancel_token, on_ready),
+    }
+}
+```
+
+### 5.2 Ajouter l'état async dans `MusicQueue`
+
+`MusicQueue` passe de simple enum de dispatch à une struct qui **encapsule** l'enum backend
+et l'état de synchronisation async :
+
+```rust
+// AVANT
+pub enum MusicQueue {
+    Internal(InternalQueue),
+    OpenHome(OpenHomeQueue),
+}
+
+// APRÈS
+pub struct MusicQueue {
+    backend: MusicQueueBackend,
+    // État async de synchronisation
+    sync_in_progress: Arc<AtomicBool>,
+    sync_pending: Arc<AtomicBool>,
+    sync_cancel_token: Arc<AtomicBool>,
+}
+
+// L'enum devient privée
+enum MusicQueueBackend {
+    Internal(InternalQueue),
+    OpenHome(OpenHomeQueue),
+}
+```
+
+**Note**: le changement de `enum` en `struct` implique de mettre à jour toutes les
+utilisations de `MusicQueue::Internal(...)` et `MusicQueue::OpenHome(...)` dans le reste
+du code (essentiellement `music_queue.rs` lui-même et `mod.rs`). Les callers externes
+utilisent `MusicQueue` via `QueueBackend` et `QueueFromRendererInfo` — ils ne sont pas
+impactés si l'API publique est préservée.
+
+### 5.3 Enum résultat et méthode `schedule_sync()`
+
+```rust
+pub enum SyncScheduleOutcome {
+    /// Thread spawné, sync en cours.
+    Scheduled,
+    /// Sync déjà en cours — annulée et nouvelle sync programmée en pending.
+    AlreadyRunning,
+}
+```
+
+```rust
+impl MusicQueue {
+    /// Lance une synchronisation asynchrone de la queue.
+    ///
+    /// - Si aucune sync n'est en cours : spawne un thread, retourne `Scheduled`.
+    /// - Si une sync est en cours : l'annule, note une sync pending, retourne `AlreadyRunning`.
+    ///   Le thread en cours finira l'opération courante, détectera le cancel, puis
+    ///   relancera la sync avec les nouveaux items via `pending_items_fn`.
+    ///
+    /// `pending_items_fn` : closure appelée dans le worker pour re-fetcher les items
+    ///   en cas de pending. Elle doit être Send + 'static car elle s'exécute dans un thread.
+    ///
+    /// `on_ready` : appelé dès que la lecture peut démarrer (pivot préservé ou 1er insert).
+    ///
+    /// `renderer_id` : utilisé uniquement pour nommer le thread de travail.
+    pub fn schedule_sync(
+        &self,  // &self car l'état async est derrière Arc<AtomicBool>
+        renderer_id: &str,
+        items: Vec<PlaybackItem>,
+        pending_items_fn: Box<dyn Fn() -> Result<Vec<PlaybackItem>, ControlPointError> + Send + 'static>,
+        on_ready: Option<Box<dyn FnOnce() + Send + 'static>>,
+    ) -> SyncScheduleOutcome
+```
+
+**Problème de `&mut self` vs `&self`** : `sync_queue()` dans le trait prend `&mut self`
+car les backends mutent leur état. Mais `schedule_sync()` veut spawner un thread qui détient
+le backend. Solution : le backend est déjà derrière `Arc<Mutex<MusicQueue>>` dans
+`MusicRenderer` (ligne 124 de musicrenderer.rs — c'est le `queue` field). Le thread worker
+clone cet `Arc` et acquiert le lock pour appeler `sync_queue()`.
+
+**Signature révisée** :
+
+```rust
+/// Doit être appelé avec un Arc<Mutex<Self>> pour permettre le spawn du thread worker.
+pub fn schedule_sync(
+    queue_arc: &Arc<Mutex<MusicQueue>>,
+    renderer_id: &str,
+    items: Vec<PlaybackItem>,
+    pending_items_fn: Box<dyn Fn() -> Result<Vec<PlaybackItem>, ControlPointError> + Send + 'static>,
+    on_ready: Option<Box<dyn FnOnce() + Send + 'static>>,
+) -> SyncScheduleOutcome {
+    use std::sync::atomic::Ordering::SeqCst;
+
+    let (sync_in_progress, sync_pending, sync_cancel_token) = {
+        let q = queue_arc.lock().unwrap();
+        (
+            Arc::clone(&q.sync_in_progress),
+            Arc::clone(&q.sync_pending),
+            Arc::clone(&q.sync_cancel_token),
+        )
+    };
+
+    if sync_in_progress.swap(true, SeqCst) {
+        // Sync en cours : annuler et noter pending
+        sync_cancel_token.store(true, SeqCst);
+        sync_pending.store(true, SeqCst);
+        return SyncScheduleOutcome::AlreadyRunning;
+    }
+
+    // Pas de sync en cours : initialiser et spawner
+    sync_cancel_token.store(false, SeqCst);
+    sync_pending.store(false, SeqCst);
+
+    let queue_arc = Arc::clone(queue_arc);
+    let thread_name = format!("queue-sync-{}", renderer_id);
+
+    thread::Builder::new()
+        .name(thread_name)
+        .spawn(move || {
+            // Guard: libère in_progress à la sortie même en cas de panic
+            struct Guard(Arc<AtomicBool>);
+            impl Drop for Guard {
+                fn drop(&mut self) { self.0.store(false, SeqCst); }
+            }
+            let _guard = Guard(Arc::clone(&sync_in_progress));
+
+            let mut current_items = items;
+            let mut current_on_ready = Some(on_ready);
+
+            loop {
+                sync_pending.store(false, SeqCst);
+                sync_cancel_token.store(false, SeqCst);
+
+                let result = {
+                    let mut q = queue_arc.lock().unwrap();
+                    q.backend.sync_queue(
+                        current_items,
+                        &sync_cancel_token,
+                        current_on_ready.take().flatten(),
+                    )
+                };
+
+                match result {
+                    Err(ControlPointError::SyncCancelled) => {
+                        // Annulé normalement — vérifier si pending
+                    }
+                    Err(e) => {
+                        warn!("queue-sync error: {}", e);
+                    }
+                    Ok(()) => {}
+                }
+
+                if !sync_pending.load(SeqCst) {
+                    break; // Pas de nouvelle sync en attente → terminer
+                }
+
+                // Nouvelle sync demandée pendant l'exécution → re-fetcher et relancer
+                match pending_items_fn() {
+                    Ok(new_items) => {
+                        current_items = new_items;
+                        current_on_ready = Some(None); // pas de on_ready pour les re-syncs
+                    }
+                    Err(e) => {
+                        warn!("queue-sync pending re-fetch error: {}", e);
+                        break;
+                    }
+                }
+            }
+            // _guard libère sync_in_progress = false
+        })
+        .expect("Failed to spawn queue-sync thread");
+
+    SyncScheduleOutcome::Scheduled
+}
+```
+
+---
+
+## Étape 6 — Nouveaux événements SSE
+
+### 6.1 `model.rs`
+
+Localiser l'enum `RendererEvent` et ajouter :
+
+```rust
+/// Émis dès que la queue peut être lue (pivot préservé ou 1er track inséré).
+QueueReadyToPlay {
+    id: DeviceId,
+},
+/// Émis quand une sync est annulée car une nouvelle a été demandée.
+QueueSyncCancelled {
+    id: DeviceId,
+},
+```
+
+### 6.2 `sse.rs`
+
+Localiser le match de sérialisation des `RendererEvent` et ajouter les deux variantes.
+Suivre le pattern existant de `QueueRefreshing` (ligne ~152) :
+
+```rust
+RendererEvent::QueueReadyToPlay { id } => {
+    // sérialiser avec type = "queue_ready_to_play"
+}
+RendererEvent::QueueSyncCancelled { id } => {
+    // sérialiser avec type = "queue_sync_cancelled"
+}
+```
+
+---
+
+## Étape 7 — Modifier `control_point.rs`
+
+### 7.1 Extraire la logique de browse
+
+Renommer `refresh_attached_queue_for()` en deux fonctions :
+
+**`fetch_queue_items_for()`** (nouvelle, interne) : fait le browse + conversion, retourne
+`Vec<PlaybackItem>`. C'est la `pending_items_fn` passée à `schedule_sync()`.
+
+**`schedule_queue_refresh_for()`** (remplace l'ancienne) : appelle `fetch_queue_items_for()`,
+puis `MusicQueue::schedule_sync()`.
+
+```rust
+fn fetch_queue_items_for(
+    registry: &Arc<RwLock<DeviceRegistry>>,
+    renderer_id: &DeviceId,
+) -> Result<Vec<PlaybackItem>, ControlPointError> {
+    // Browse media server + conversion PlaybackItem
+    // (logique actuellement dans refresh_attached_queue_for() lignes ~1593-1670)
+}
+
+fn schedule_queue_refresh_for(
+    registry: &Arc<RwLock<DeviceRegistry>>,
+    renderer_id: &DeviceId,
+    event_bus: &RendererEventBus,
+    auto_play_cb: Option<Box<dyn FnOnce(&DeviceId) -> Result<(), ControlPointError> + Send + 'static>>,
+) -> SyncScheduleOutcome {
+    let items = match fetch_queue_items_for(registry, renderer_id) {
+        Ok(items) => items,
+        Err(e) => { warn!(...); return SyncScheduleOutcome::Scheduled; /* ou erreur */ }
+    };
+
+    // on_ready : déclenche auto_play si demandé + émet QueueReadyToPlay SSE
+    let rid = renderer_id.clone();
+    let bus = event_bus.clone();
+    let on_ready: Option<Box<dyn FnOnce() + Send + 'static>> = Some(Box::new(move || {
+        bus.broadcast(RendererEvent::QueueReadyToPlay { id: rid.clone() });
+        if let Some(cb) = auto_play_cb {
+            if let Err(e) = cb(&rid) {
+                warn!("auto-play callback failed: {}", e);
+            }
+        }
+    }));
+
+    // pending_items_fn : re-fetcher depuis le media server si pending
+    let registry2 = Arc::clone(registry);
+    let rid2 = renderer_id.clone();
+    let pending_fn = Box::new(move || fetch_queue_items_for(&registry2, &rid2));
+
+    // Récupérer l'Arc<Mutex<MusicQueue>> du renderer depuis le registry
+    let queue_arc = {
+        let reg = registry.read().unwrap();
+        reg.get_renderer_queue_arc(renderer_id)? // méthode à ajouter dans DeviceRegistry
+    };
+
+    // Émettre QueueRefreshing avant de lancer
+    event_bus.broadcast(RendererEvent::QueueRefreshing { id: renderer_id.clone() });
+
+    let outcome = MusicQueue::schedule_sync(&queue_arc, &renderer_id.0, items, pending_fn, on_ready);
+
+    if matches!(outcome, SyncScheduleOutcome::AlreadyRunning) {
+        event_bus.broadcast(RendererEvent::QueueSyncCancelled { id: renderer_id.clone() });
+    }
+
+    outcome
+}
+```
+
+### 7.2 Call site 1 — thread "cp-media-server-event-worker" (l.270)
+
+```rust
+// AVANT
+let _ = refresh_attached_queue_for(&registry, &renderer_id, &event_bus, None);
+// APRÈS
+schedule_queue_refresh_for(&registry, &renderer_id, &event_bus, None);
+```
+
+### 7.3 Call site 2 — thread "cp-playlist-periodic-refresh" (l.340)
+
+```rust
+// AVANT
+let _ = refresh_attached_queue_for(&registry_for_periodic, &renderer_id, &event_bus_for_periodic, None);
+// APRÈS
+schedule_queue_refresh_for(&registry_for_periodic, &renderer_id, &event_bus_for_periodic, None);
+```
+
+### 7.4 Call site 3 — `attach_queue_to_playlist_async()` (l.1264)
+
+```rust
+pub async fn attach_queue_to_playlist_async(
+    &self, renderer_id: &DeviceId, server_id: &DeviceId, container_id: &str, auto_play: bool,
+) -> Result<(), ControlPointError> {
+    // 1. Enregistrer la liaison (synchrone, ~1ms)
+    self.registry.write().unwrap()
+        .set_playlist_binding(renderer_id, server_id, container_id);
+
+    // 2. Construire le callback auto-play si demandé
+    let cp = self.clone();
+    let rid = renderer_id.clone();
+    let auto_play_cb: Option<Box<dyn FnOnce(&DeviceId) -> Result<(), ControlPointError> + Send + 'static>> =
+        if auto_play {
+            Some(Box::new(move |id| cp.play_current_from_queue(id)))
+        } else {
+            None
+        };
+
+    // 3. Lancer le refresh async — retourne immédiatement
+    schedule_queue_refresh_for(&self.registry, renderer_id, &self.event_bus, auto_play_cb);
+
+    Ok(())  // La webapp sera notifiée via SSE (QueueRefreshing → QueueReadyToPlay → QueueUpdated)
+}
+```
+
+### 7.5 Fin de sync — émettre `QueueUpdated`
+
+L'événement `QueueUpdated` (avec `queue_length`) est actuellement émis à la ligne ~1718
+dans `refresh_attached_queue_for()`. Il doit être émis à la fin du worker thread dans
+`MusicQueue::schedule_sync()`, après le `sync_queue()` réussi.
+
+Passer un `on_complete` callback à `schedule_sync()` (en plus de `on_ready`) :
+
+```rust
+pub fn schedule_sync(
+    queue_arc: &Arc<Mutex<MusicQueue>>,
+    renderer_id: &str,
+    items: Vec<PlaybackItem>,
+    pending_items_fn: Box<dyn Fn() -> Result<Vec<PlaybackItem>, ControlPointError> + Send + 'static>,
+    on_ready: Option<Box<dyn FnOnce() + Send + 'static>>,
+    on_complete: Box<dyn Fn(usize) + Send + 'static>,  // NOUVEAU — reçoit queue_length
+) -> SyncScheduleOutcome
+```
+
+Dans le worker, après `Ok(())` du `sync_queue()` :
+
+```rust
+Ok(()) => {
+    let queue_len = queue_arc.lock().unwrap().len().unwrap_or(0);
+    on_complete(queue_len);
+}
+```
+
+Dans `schedule_queue_refresh_for()` :
+
+```rust
+let bus3 = event_bus.clone();
+let rid3 = renderer_id.clone();
+let on_complete = Box::new(move |queue_len: usize| {
+    bus3.broadcast(RendererEvent::QueueUpdated {
+        id: rid3.clone(),
+        queue_length: queue_len,
+    });
+});
+```
+
+---
+
+## Étape 8 — Accès à `Arc<Mutex<MusicQueue>>` depuis le registry
+
+`schedule_queue_refresh_for()` a besoin d'accéder à l'`Arc<Mutex<MusicQueue>>` du renderer.
+Localiser dans `DeviceRegistry` comment les renderers et leurs queues sont stockés, et ajouter
+une méthode :
+
+```rust
+pub fn get_renderer_queue_arc(
+    &self,
+    renderer_id: &DeviceId,
+) -> Result<Arc<Mutex<MusicQueue>>, ControlPointError>
+```
+
+(Ou équivalent selon la structure réelle du registry.)
+
+---
+
+## Ordre d'implémentation
+
+```
+Étape 1 (errors.rs)          ← 5 min
+Étape 2 (backend.rs)         ← 10 min, casse la compilation → à faire avant les autres
+Étape 3 (interne.rs)         ← 30 min
+Étape 4 (openhome.rs)        ← 1-2h (nombreux points de vérification cancel)
+Étape 5 (music_queue.rs)     ← 2-3h (changement struct + schedule_sync)
+Étape 6 (model.rs + sse.rs)  ← 30 min
+Étape 7 (control_point.rs)   ← 1h
+Étape 8 (registry)           ← 30 min selon la structure
+```
+
+Après l'étape 2, `cargo build` cassera jusqu'à l'étape 5 incluse — c'est attendu.
+Faire les étapes 3, 4, 5 dans la même session sans interrompre.
+
+## Tests
+
+```bash
+cargo build -p pmocontrol
+
+# Vérifier les scénarios :
+# 1. Attach playlist → QueueRefreshing SSE immédiat, QueueReadyToPlay après 1er insert,
+#    QueueUpdated après fin complète
+# 2. Attach 2e playlist pendant sync en cours → QueueSyncCancelled + nouveau refresh repart
+# 3. Piste en cours de lecture pendant sync → QueueReadyToPlay immédiat (pivot préservé)
+# 4. Refresh périodique (60s) ne bloque plus son thread
+
+RUST_LOG=debug cargo run 2>&1 | grep -E "queue.sync|SyncCancelled|Scheduled|AlreadyRunning|on_ready|on_complete"
+```
+
+---
+
+*Date: 2026-04-09*

Cargo.lock

@@ -4,7 +4,7 @@ version = 4
 
 [[package]]
 name = "PMOMusic"
-version = "0.3.40"
+version = "0.3.41"
 dependencies = [
  "axum 0.8.7",
  "console-subscriber",

PMOMusic/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "PMOMusic"
-version = "0.3.40"
+version = "0.3.41"
 edition = "2024"
 
 [dependencies]

pmocontrol/src/control_point.rs

@@ -26,7 +26,7 @@ use crate::openapi::{
     CurrentTrackMetadata, FullRendererSnapshot, QueueItem, QueueSnapshotView, RendererBindingView,
     RendererStateView,
 };
-use crate::queue::{EnqueueMode, PlaybackItem, QueueSnapshot};
+use crate::queue::{EnqueueMode, PlaybackItem, QueueSnapshot, SyncScheduleOutcome};
 use crate::registry::DeviceRegistry;
 
 /// Control point minimal :
@@ -267,19 +267,12 @@ impl ControlPoint {
                                     "Triggering queue refresh for bound playlist"
                                 );
 
-                                if let Err(err) = refresh_attached_queue_for(
+                                let _ = schedule_queue_refresh_for(
                                     &registry_for_media_worker,
                                     &renderer_id,
                                     &event_bus_for_media_worker,
                                     None,
-                                ) {
+                                );
-                                    warn!(
-                                        renderer = renderer_id.0.as_str(),
-                                        server = server_id.0.as_str(),
-                                        error = %err,
-                                        "Failed to refresh queue from playlist container"
-                                    );
-                                }
                             }
                         }
                         MediaServerEvent::Online { server_id, info } => {
@@ -337,18 +330,12 @@ impl ControlPoint {
                             "Periodic refresh triggered for bound playlist"
                         );
 
-                        if let Err(err) = refresh_attached_queue_for(
+                        let _ = schedule_queue_refresh_for(
                             &registry_for_periodic,
                             &renderer_id,
                             &event_bus_for_periodic,
                             None,
-                        ) {
+                        );
-                            warn!(
-                                renderer = renderer_id.0.as_str(),
-                                error = %err,
-                                "Periodic refresh failed for bound playlist"
-                            );
-                        }
                     }
                 }
             })?;
@@ -1182,19 +1169,25 @@ impl ControlPoint {
             binding.auto_play_on_refresh = auto_play;
             renderer.set_playlist_binding(Some(binding));
 
-            let mut auto_start_cb = |rid: &DeviceId| self.play_current_from_queue(rid);
+            let callback: Option<Box<dyn FnOnce(&DeviceId) -> Result<(), ControlPointError> + Send + 'static>> =
-            let callback: Option<&mut dyn FnMut(&DeviceId) -> Result<(), ControlPointError>> =
                 if auto_play {
-                    Some(&mut auto_start_cb)
+                    let reg = Arc::clone(&self.registry);
+                    Some(Box::new(move |rid: &DeviceId| {
+                        let renderer = reg.read().unwrap().get_renderer(rid).ok_or_else(|| 
+                            ControlPointError::ControlPoint(format!("Renderer {} not found", rid.0))
+                        )?;
+                        renderer.play_current_from_queue()
+                    }))
                 } else {
                     None
                 };
-            return refresh_attached_queue_for(
+            let _ = schedule_queue_refresh_for(
                 &self.registry,
                 renderer_id,
                 &self.event_bus,
                 callback,
             );
+            return Ok(());
         }
 
         // CRITICAL: When attaching a new playlist to a renderer, we must UNCONDITIONALLY
@@ -1247,21 +1240,25 @@ impl ControlPoint {
         // Note: BindingChanged event is emitted automatically by MusicRenderer::set_playlist_binding()
 
         // For initial attach with auto_play, force playback start (don't check if idle)
-        let mut auto_start_cb = |rid: &DeviceId| {
+        let callback: Option<Box<dyn FnOnce(&DeviceId) -> Result<(), ControlPointError> + Send + 'static>> =
-            debug!(
-                renderer = rid.0.as_str(),
-                "Attach callback: forcing playback start (not checking if idle)"
-            );
-            self.play_current_from_queue(rid)
-        };
-        let callback: Option<&mut dyn FnMut(&DeviceId) -> Result<(), ControlPointError>> =
             if auto_play {
-                Some(&mut auto_start_cb)
+                let reg = Arc::clone(&self.registry);
+                Some(Box::new(move |rid: &DeviceId| {
+                    debug!(
+                        renderer = rid.0.as_str(),
+                        "Attach callback: forcing playback start (not checking if idle)"
+                    );
+                    let renderer = reg.read().unwrap().get_renderer(rid).ok_or_else(|| 
+                        ControlPointError::ControlPoint(format!("Renderer {} not found", rid.0))
+                    )?;
+                    renderer.play_current_from_queue()
+                }))
             } else {
                 None
             };
 
-        refresh_attached_queue_for(&self.registry, renderer_id, &self.event_bus, callback)
+        let _ = schedule_queue_refresh_for(&self.registry, renderer_id, &self.event_bus, callback);
+        Ok(())
     }
 
     /// Detach a renderer's queue from its associated playlist container.
@@ -1760,6 +1757,199 @@ fn refresh_attached_queue_for(
     Ok(())
 }
 
+fn fetch_queue_items_for(
+    music_server: &Arc<crate::media_server::MusicServer>,
+    container_id: &str,
+) -> Result<Vec<PlaybackItem>, ControlPointError> {
+    const MAX_BROWSE_ATTEMPTS: usize = 3;
+    const BROWSE_RETRY_DELAY_MS: u64 = 200;
+    const BROWSE_PAGE_SIZE: u32 = 64;
+
+    let entries = {
+        let mut all_entries = Vec::new();
+        let mut offset = 0u32;
+        loop {
+            let mut attempt = 1;
+            let page = loop {
+                match music_server.browse_children(container_id, offset, BROWSE_PAGE_SIZE) {
+                    Ok(e) => break e,
+                    Err(err) => {
+                        if attempt >= MAX_BROWSE_ATTEMPTS {
+                            return Err(err);
+                        }
+                        thread::sleep(Duration::from_millis(
+                            BROWSE_RETRY_DELAY_MS * attempt as u64,
+                        ));
+                        attempt += 1;
+                    }
+                }
+            };
+            let fetched = page.len() as u32;
+            all_entries.extend(page);
+            if fetched < BROWSE_PAGE_SIZE {
+                break;
+            }
+            offset += fetched;
+        }
+        all_entries
+    };
+
+    let new_items: Vec<PlaybackItem> = entries
+        .iter()
+        .filter_map(|entry| playback_item_from_entry(music_server.clone(), entry))
+        .collect();
+
+    Ok(new_items)
+}
+
+fn schedule_queue_refresh_for(
+    registry: &Arc<RwLock<DeviceRegistry>>,
+    renderer_id: &DeviceId,
+    event_bus: &RendererEventBus,
+    after_refresh: Option<Box<dyn FnOnce(&DeviceId) -> Result<(), ControlPointError> + Send + 'static>>,
+) -> SyncScheduleOutcome {
+    // Step 1: Get renderer from registry
+    let renderer = {
+        let reg = registry.read().unwrap();
+        reg.get_renderer(renderer_id)
+    };
+
+    let renderer = match renderer {
+        Some(r) => r,
+        None => {
+            debug!(
+                renderer = renderer_id.0.as_str(),
+                "schedule_queue_refresh_for: renderer not found"
+            );
+            return SyncScheduleOutcome::Scheduled;
+        }
+    };
+
+    // Check if there's a binding
+    let (server_id, container_id) = {
+        let binding = match renderer.get_playlist_binding() {
+            Some(b) => b,
+            None => {
+                debug!(
+                    renderer = renderer_id.0.as_str(),
+                    "schedule_queue_refresh_for: no binding present"
+                );
+                return SyncScheduleOutcome::Scheduled;
+            }
+        };
+        (binding.server_id.clone(), binding.container_id.clone())
+    };
+
+    // Step 2: Get server from registry
+    let music_server = {
+        let reg = registry.read().unwrap();
+        reg.get_server(&server_id)
+    };
+
+    let music_server = match music_server {
+        Some(s) => s,
+        None => {
+            warn!(
+                renderer = renderer_id.0.as_str(),
+                server = server_id.0.as_str(),
+                "schedule_queue_refresh_for: server not found in registry"
+            );
+            return SyncScheduleOutcome::Scheduled;
+        }
+    };
+
+    if !music_server.is_online() {
+        debug!(
+            renderer = renderer_id.0.as_str(),
+            server = server_id.0.as_str(),
+            "schedule_queue_refresh_for: server offline, skipping refresh"
+        );
+        return SyncScheduleOutcome::Scheduled;
+    }
+
+    // Emit QueueRefreshing
+    event_bus.broadcast(RendererEvent::QueueRefreshing {
+        id: renderer_id.clone(),
+    });
+
+    // Get the queue Arc
+    let queue_arc = {
+        let reg = registry.read().unwrap();
+        match reg.get_renderer_queue_arc(renderer_id) {
+            Some(q) => q,
+            None => {
+                warn!("schedule_queue_refresh_for: could not get queue arc");
+                return SyncScheduleOutcome::Scheduled;
+            }
+        }
+    };
+
+    // Build the pending_items_fn for re-fetching
+    let registry_clone = Arc::clone(registry);
+    let server_id_clone = server_id.clone();
+    let container_id_clone = container_id.clone();
+    let pending_fn = Box::new(move || {
+        let music_server = {
+            let reg = registry_clone.read().unwrap();
+            reg.get_server(&server_id_clone)
+        };
+        match music_server {
+            Some(s) => fetch_queue_items_for(&s, &container_id_clone),
+            None => Err(ControlPointError::MediaServerError("Server not found".to_string())),
+        }
+    });
+
+    // Build on_ready callback
+    let rid = renderer_id.clone();
+    let bus = event_bus.clone();
+    let after_cb = after_refresh;
+    let on_ready: Option<Box<dyn FnOnce() + Send + 'static>> = Some(Box::new(move || {
+        bus.broadcast(RendererEvent::QueueReadyToPlay { id: rid.clone() });
+        if let Some(cb) = after_cb {
+            if let Err(e) = cb(&rid) {
+                warn!("auto-play callback failed: {}", e);
+            }
+        }
+    }));
+
+    // Build on_complete callback
+    let rid2 = renderer_id.clone();
+    let bus2 = event_bus.clone();
+    let on_complete = Box::new(move |queue_len: usize| {
+        bus2.broadcast(RendererEvent::QueueUpdated {
+            id: rid2.clone(),
+            queue_length: queue_len,
+        });
+    });
+
+    // First fetch
+    let items = match fetch_queue_items_for(&music_server, &container_id) {
+        Ok(items) => items,
+        Err(e) => {
+            warn!("schedule_queue_refresh_for: failed to fetch items: {}", e);
+            return SyncScheduleOutcome::Scheduled;
+        }
+    };
+
+    // Call schedule_sync
+    let outcome = crate::queue::MusicQueue::schedule_sync(
+        &queue_arc,
+        &renderer_id.0,
+        items,
+        pending_fn,
+        on_ready,
+        on_complete,
+    );
+
+    if matches!(outcome, SyncScheduleOutcome::AlreadyRunning) {
+        event_bus.broadcast(RendererEvent::QueueSyncCancelled {
+            id: renderer_id.clone(),
+        });
+    }
+
+    outcome
+}
+
 fn didl_item_from_playback_item(item: &PlaybackItem) -> DidlItem {
     let metadata = item.metadata.as_ref();
     let title = metadata

pmocontrol/src/errors.rs

@@ -49,6 +49,8 @@ pub enum ControlPointError {
     SnapshotError(String),
     #[error("Error on ControlPoint: {0}")]
     ControlPoint(String),
+    #[error("Queue sync cancelled (superseded by a newer request)")]
+    SyncCancelled,
 }
 
 impl ControlPointError {

pmocontrol/src/model.rs

@@ -437,6 +437,12 @@ pub enum RendererEvent {
     QueueRefreshing {
         id: DeviceId,
     },
+    QueueReadyToPlay {
+        id: DeviceId,
+    },
+    QueueSyncCancelled {
+        id: DeviceId,
+    },
     BindingChanged {
         id: DeviceId,
         binding: Option<PlaylistBinding>,

pmocontrol/src/music_renderer/arylic_tcp.rs

@@ -1,26 +1,26 @@
-use std::sync::{Arc, Mutex};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::time::Duration;
 
 use serde::Deserialize;
 use tracing::debug;
 
-use crate::DeviceIdentity;
 use crate::arylic_client::{
-    ARYLIC_TCP_PORT, DEFAULT_TIMEOUT_SECS, send_command_no_response, send_command_optional,
+    send_command_no_response, send_command_optional, send_command_required, ARYLIC_TCP_PORT,
-    send_command_required,
+    DEFAULT_TIMEOUT_SECS,
 };
 use crate::errors::ControlPointError;
 use crate::linkplay_client::extract_linkplay_host;
 use crate::model::{PlaybackState, RendererInfo};
-use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::music_renderer::capabilities::{
     PlaybackPosition, PlaybackPositionInfo, PlaybackStatus, QueueTransportControl, RendererBackend,
     TransportControl, VolumeControl,
 };
 use crate::music_renderer::musicrenderer::MusicRendererBackend;
 use crate::music_renderer::time_utils::{format_hhmmss, ms_to_seconds, parse_hhmmss_strict};
+use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::queue::MusicQueue;
 use crate::queue::{EnqueueMode, PlaybackItem, QueueBackend, QueueSnapshot};
+use crate::DeviceIdentity;
 
 /// Raw response from Arylic MCU+PINFGET command
 #[derive(Debug, Deserialize)]
@@ -409,8 +409,16 @@ impl QueueBackend for ArylicTcpRenderer {
             .replace_queue(items, current_index)
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        self.queue.lock().unwrap().sync_queue(items)
+        &mut self,
+        items: Vec<PlaybackItem>,
+        _cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        self.queue
+            .lock()
+            .unwrap()
+            .sync_queue(items, &Arc::new(AtomicBool::new(false)), on_ready)
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {

pmocontrol/src/music_renderer/chromecast_renderer.rs

@@ -11,6 +11,7 @@
 //! are wrapped in sync calls using smol::block_on for compatibility with
 //! the existing sync trait interfaces.
 
+use std::sync::atomic::AtomicBool;
 use std::sync::{Arc, Mutex, Once};
 use std::thread::JoinHandle;
 
@@ -906,8 +907,16 @@ impl QueueBackend for ChromecastRenderer {
             .replace_queue(items, current_index)
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        self.queue.lock().unwrap().sync_queue(items)
+        &mut self,
+        items: Vec<PlaybackItem>,
+        _cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        self.queue
+            .lock()
+            .unwrap()
+            .sync_queue(items, &Arc::new(AtomicBool::new(false)), on_ready)
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {

pmocontrol/src/music_renderer/linkplay_renderer.rs

@@ -1,24 +1,24 @@
 use std::fmt;
-use std::sync::{Arc, Mutex};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::time::Duration;
 
 use ureq::Agent;
 
-use crate::DeviceIdentity;
 use crate::errors::ControlPointError;
 use crate::linkplay_client::{
-    LinkPlayStatus, build_agent, extract_linkplay_host, fetch_status_for_host, percent_encode,
+    build_agent, extract_linkplay_host, fetch_status_for_host, percent_encode, LinkPlayStatus,
 };
 use crate::model::{PlaybackState, RendererInfo};
-use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::music_renderer::capabilities::{
     PlaybackPosition, PlaybackPositionInfo, PlaybackStatus, QueueTransportControl, RendererBackend,
     TransportControl, VolumeControl,
 };
 use crate::music_renderer::musicrenderer::MusicRendererBackend;
 use crate::music_renderer::time_utils::parse_hhmmss_strict;
+use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::queue::MusicQueue;
 use crate::queue::{EnqueueMode, PlaybackItem, QueueBackend, QueueSnapshot};
+use crate::DeviceIdentity;
 
 const DEFAULT_HTTP_TIMEOUT_SECS: u64 = 3;
 
@@ -287,8 +287,16 @@ impl QueueBackend for LinkPlayRenderer {
             .replace_queue(items, current_index)
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        self.queue.lock().unwrap().sync_queue(items)
+        &mut self,
+        items: Vec<PlaybackItem>,
+        _cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        self.queue
+            .lock()
+            .unwrap()
+            .sync_queue(items, &Arc::new(AtomicBool::new(false)), on_ready)
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {

pmocontrol/src/music_renderer/musicrenderer.rs

@@ -976,6 +976,12 @@ impl MusicRenderer {
         Ok(snapshot)
     }
 
+    /// Get a clone of the queue Arc (for async sync operations).
+    pub fn queue(&self) -> Arc<Mutex<MusicQueue>> {
+        let backend = self.lock_backend_for("queue");
+        crate::music_renderer::capabilities::RendererBackend::queue(&*backend).clone()
+    }
+
     /// Get the current queue item without advancing.
     /// Returns the item and count of remaining items after current.
     pub fn peek_current(&self) -> Result<Option<(PlaybackItem, usize)>, ControlPointError> {
@@ -1372,7 +1378,16 @@ impl MusicRenderer {
     /// - If the current track is NOT in the new items, it's preserved as the first item
     /// - If there's no current track, the queue is simply replaced
     pub fn sync_queue(&self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
-        // Mark renderer as active for adaptive polling
+        self.sync_queue_with_callback(items, None, None)
+    }
+
+    /// Synchronize the queue with new items with optional cancel token and on_ready callback.
+    pub fn sync_queue_with_callback(
+        &self,
+        items: Vec<PlaybackItem>,
+        cancel_token: Option<&Arc<AtomicBool>>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
         {
             let mut watched = self
                 .watched_state
@@ -1382,7 +1397,9 @@ impl MusicRenderer {
         }
 
         let mut backend = self.lock_backend_for("sync_queue");
-        backend.sync_queue(items)?;
+        let dummy_token = Arc::new(AtomicBool::new(false));
+        let token = cancel_token.unwrap_or(&dummy_token);
+        backend.sync_queue(items, token, on_ready)?;
         drop(backend);
         self.emit_queue_updated();
         Ok(())
@@ -2283,14 +2300,21 @@ impl QueueBackend for MusicRendererBackend {
         }
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
+        &mut self,
+        items: Vec<PlaybackItem>,
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
         match self {
-            MusicRendererBackend::Upnp(r) => r.sync_queue(items),
+            MusicRendererBackend::Upnp(r) => r.sync_queue(items, cancel_token, on_ready),
-            MusicRendererBackend::OpenHome(r) => r.sync_queue(items),
+            MusicRendererBackend::OpenHome(r) => r.sync_queue(items, cancel_token, on_ready),
-            MusicRendererBackend::LinkPlay(r) => r.sync_queue(items),
+            MusicRendererBackend::LinkPlay(r) => r.sync_queue(items, cancel_token, on_ready),
-            MusicRendererBackend::ArylicTcp(r) => r.sync_queue(items),
+            MusicRendererBackend::ArylicTcp(r) => r.sync_queue(items, cancel_token, on_ready),
-            MusicRendererBackend::Chromecast(cc) => cc.sync_queue(items),
+            MusicRendererBackend::Chromecast(cc) => cc.sync_queue(items, cancel_token, on_ready),
-            MusicRendererBackend::HybridUpnpArylic { upnp, .. } => upnp.sync_queue(items),
+            MusicRendererBackend::HybridUpnpArylic { upnp, .. } => {
+                upnp.sync_queue(items, cancel_token, on_ready)
+            }
         }
     }
 

pmocontrol/src/music_renderer/openhome_renderer.rs

@@ -1,4 +1,4 @@
-use std::sync::{Arc, Mutex};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::time::SystemTime;
 
 use crate::music_renderer::capabilities::{
@@ -182,9 +182,8 @@ impl OpenHomeRenderer {
     /// Retourne les IDs des pistes de la playlist OpenHome.
     /// Plus rapide que snapshot_openhome_playlist() car ne récupère pas les métadonnées.
     pub(crate) fn openhome_playlist_ids(&self) -> Result<Vec<u32>, ControlPointError> {
-        // Use the queue's cached track_ids() instead of direct id_array() call
         let queue = self.queue.lock().unwrap();
-        if let MusicQueue::OpenHome(oh_queue) = &*queue {
+        if let Some(oh_queue) = queue.as_openhome() {
             oh_queue.track_ids()
         } else {
             Err(ControlPointError::QueueError(
@@ -209,9 +208,8 @@ impl OpenHomeRenderer {
         let insert_after = match after_id {
             Some(id) => id,
             None => {
-                // Use the queue's cached track_ids() instead of direct id_array() call
                 let queue = self.queue.lock().unwrap();
-                if let MusicQueue::OpenHome(oh_queue) = &*queue {
+                if let Some(oh_queue) = queue.as_openhome() {
                     oh_queue
                         .track_ids()?
                         .last()
@@ -413,7 +411,7 @@ impl PlaybackPosition for OpenHomeRenderer {
 
         // Get track ID from queue (uses cached data)
         let queue_guard_for_id = self.queue.lock().unwrap();
-        if let MusicQueue::OpenHome(oh_queue) = &*queue_guard_for_id {
+        if let Some(oh_queue) = queue_guard_for_id.as_openhome() {
             match oh_queue.current_track() {
                 Ok(id_opt) => track_id = id_opt,
                 Err(err) => debug!(
@@ -696,11 +694,16 @@ impl QueueBackend for OpenHomeRenderer {
             .replace_queue(items, current_index)
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
+        &mut self,
+        items: Vec<PlaybackItem>,
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
         self.queue
             .lock()
             .map_err(|_| ControlPointError::QueueError("Queue mutex poisoned".into()))?
-            .sync_queue(items)
+            .sync_queue(items, cancel_token, on_ready)
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {

pmocontrol/src/music_renderer/upnp_renderer.rs

@@ -1,13 +1,13 @@
-use std::sync::{Arc, Mutex};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
 
 use crate::errors::ControlPointError;
 use crate::model::PlaybackState;
-use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::music_renderer::capabilities::{
     PlaybackPosition, PlaybackPositionInfo, PlaybackStatus, QueueTransportControl, RendererBackend,
     TransportControl, VolumeControl,
 };
-use crate::music_renderer::musicrenderer::{MusicRendererBackend, build_didl_lite_metadata};
+use crate::music_renderer::musicrenderer::{build_didl_lite_metadata, MusicRendererBackend};
+use crate::music_renderer::RendererFromMediaRendererInfo;
 use crate::queue::{EnqueueMode, MusicQueue, PlaybackItem, QueueBackend, QueueSnapshot};
 use crate::upnp_clients::{
     AvTransportClient, ConnectionInfo, ConnectionManagerClient, PositionInfo, ProtocolInfo,
@@ -318,8 +318,16 @@ impl QueueBackend for UpnpRenderer {
             .replace_queue(items, current_index)
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        self.queue.lock().unwrap().sync_queue(items)
+        &mut self,
+        items: Vec<PlaybackItem>,
+        _cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        self.queue
+            .lock()
+            .unwrap()
+            .sync_queue(items, &Arc::new(AtomicBool::new(false)), on_ready)
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {

pmocontrol/src/queue/backend.rs

@@ -28,7 +28,8 @@
 //!   - This identity is used by the sync helpers to preserve the current
 //!     track across queue rebuilds when the MediaServer content changes.
 
-use crate::{PlaybackItem, QueueSnapshot, errors::ControlPointError};
+use crate::{errors::ControlPointError, PlaybackItem, QueueSnapshot};
+use std::sync::{atomic::AtomicBool, Arc};
 
 /// High-level enqueue mode.
 ///
@@ -107,7 +108,12 @@ pub trait QueueBackend {
     /// corresponds to the old current index track.
     /// If the old current index track is absent from the new queue,
     /// it is kept as the first item and the new items are appended after it.
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError>;
+    fn sync_queue(
+        &mut self,
+        items: Vec<PlaybackItem>,
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError>;
 
     /// Returns the item at `index`, if it exists.
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError>;

pmocontrol/src/queue/interne.rs

@@ -20,6 +20,7 @@ use crate::{
     queue::{MusicQueue, PlaybackItem, QueueBackend, QueueFromRendererInfo, QueueSnapshot},
     DeviceId, DeviceIdentity, RendererInfo,
 };
+use std::sync::{atomic::AtomicBool, Arc};
 
 /// Internal/local queue implementation.
 ///
@@ -269,25 +270,43 @@ impl QueueBackend for InternalQueue {
         Ok(())
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        use tracing::debug;
+        &mut self,
+        items: Vec<PlaybackItem>,
+        cancel_token: &Arc<AtomicBool>,
+        mut on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        use std::sync::atomic::Ordering::SeqCst;
 
-        if items.is_empty() {
+        if cancel_token.load(SeqCst) {
-            return self.replace_queue(Vec::new(), None);
+            return Err(ControlPointError::SyncCancelled);
+        }
+
+        let has_current = self.current_index().ok().flatten().is_some();
+        if has_current {
+            if let Some(f) = on_ready.take() {
+                f();
+            }
+        }
+
+        if items.is_empty() {
+            let _ = self.replace_queue(Vec::new(), None);
+            return Ok(());
         }
 
-        // Protéger les durées des streams contre la diminution
         let updated_items = self.protect_stream_durations(items);
 
-        // Récupérer l'item actuel
         let current = self.current_index.and_then(|idx| {
             self.items
                 .get(idx)
                 .map(|item| (idx, item.uri.clone(), item.didl_id.clone()))
         });
 
+        if cancel_token.load(SeqCst) {
+            return Err(ControlPointError::SyncCancelled);
+        }
+
         if let Some((_current_idx, current_uri, current_didl_id)) = current {
-            // Chercher l'item actuel dans la nouvelle liste (par URI d'abord, puis par didl_id)
             let new_idx = updated_items
                 .iter()
                 .position(|item| item.uri == current_uri)
@@ -298,34 +317,25 @@ impl QueueBackend for InternalQueue {
                 });
 
             if let Some(new_idx) = new_idx {
-                // Item trouvé dans la nouvelle liste
+                self.replace_queue(updated_items, Some(new_idx))?;
-                debug!(
-                    renderer = self.renderer_id.0.as_str(),
-                    current_uri = current_uri.as_str(),
-                    new_idx,
-                    "sync_queue: current item found in new playlist"
-                );
-                self.replace_queue(updated_items, Some(new_idx))
             } else {
-                // Item pas trouvé - cela ne devrait pas arriver si la playlist n'a pas changé
-                // Loguer pour diagnostic
-                debug!(
-                    renderer = self.renderer_id.0.as_str(),
-                    current_uri = current_uri.as_str(),
-                    current_didl_id = current_didl_id.as_str(),
-                    new_items_count = updated_items.len(),
-                    "sync_queue: current item NOT found in new playlist, preserving as first item"
-                );
                 let current_item = self.items[self.current_index.unwrap()].clone();
                 let mut new_items = Vec::with_capacity(updated_items.len() + 1);
                 new_items.push(current_item);
                 new_items.extend(updated_items);
-                self.replace_queue(new_items, Some(0))
+                self.replace_queue(new_items, Some(0))?;
             }
         } else {
-            // Pas d'item actuel
+            self.replace_queue(updated_items, None)?;
-            self.replace_queue(updated_items, None)
         }
+
+        if !has_current {
+            if let Some(f) = on_ready.take() {
+                f();
+            }
+        }
+
+        Ok(())
     }
 
     fn enqueue_items(
@@ -502,6 +512,6 @@ impl QueueFromRendererInfo for InternalQueue {
     }
 
     fn to_backend(self) -> MusicQueue {
-        MusicQueue::Internal(self)
+        MusicQueue::from_internal(self)
     }
 }

pmocontrol/src/queue/mod.rs

@@ -7,20 +7,23 @@ mod snapshot;
 use std::sync::{Arc, Mutex};
 
 pub use backend::{EnqueueMode, QueueBackend};
-pub use music_queue::MusicQueue;
+pub use music_queue::{MusicQueue, SyncScheduleOutcome};
 pub use snapshot::{PlaybackItem, QueueSnapshot};
 
 // Internal queue implementations - not part of the public API
 pub(crate) use interne::InternalQueue;
 pub(crate) use openhome::OpenHomeQueue;
 
-use crate::{RendererInfo, errors::ControlPointError};
 use crate::music_renderer::time_utils::parse_time_flexible;
+use crate::{errors::ControlPointError, RendererInfo};
 
 /// Returns true if `new_dur` < `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
 /// Used to protect stream durations from decreasing for the same track.
 pub(super) fn stream_duration_decreased(old_dur: &str, new_dur: &str) -> bool {
-    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+    match (
+        parse_time_flexible(old_dur).ok(),
+        parse_time_flexible(new_dur).ok(),
+    ) {
         (Some(old_secs), Some(new_secs)) => new_secs < old_secs,
         _ => false,
     }
@@ -28,7 +31,10 @@ pub(super) fn stream_duration_decreased(old_dur: &str, new_dur: &str) -> bool {
 
 /// Returns true if `new_dur` > `old_dur` (both parseable as HH:MM:SS/MM:SS/SS).
 pub(super) fn stream_duration_increased(old_dur: &str, new_dur: &str) -> bool {
-    match (parse_time_flexible(old_dur).ok(), parse_time_flexible(new_dur).ok()) {
+    match (
+        parse_time_flexible(old_dur).ok(),
+        parse_time_flexible(new_dur).ok(),
+    ) {
         (Some(old_secs), Some(new_secs)) => new_secs > old_secs,
         _ => false,
     }

pmocontrol/src/queue/music_queue.rs

@@ -3,84 +3,297 @@ use crate::queue::{
     EnqueueMode, InternalQueue, OpenHomeQueue, QueueBackend, QueueFromRendererInfo,
 };
 use crate::{PlaybackItem, QueueSnapshot, RendererInfo};
+use std::sync::{
+    atomic::{AtomicBool, Ordering::SeqCst},
+    Arc, Mutex,
+};
+use std::thread;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SyncScheduleOutcome {
+    Scheduled,
+    AlreadyRunning,
+}
 
 #[derive(Debug)]
-pub enum MusicQueue {
+enum MusicQueueBackend {
     Internal(InternalQueue),
     OpenHome(OpenHomeQueue),
 }
 
+#[derive(Debug)]
+pub struct MusicQueue {
+    backend: MusicQueueBackend,
+    sync_in_progress: Arc<AtomicBool>,
+    sync_pending: Arc<AtomicBool>,
+    sync_cancel_token: Arc<AtomicBool>,
+}
+
 impl MusicQueue {
     /// Creates a queue appropriate for the given renderer.
     /// This is the factory method used by QueueFromRendererInfo trait.
     pub fn from_renderer_info(info: &RendererInfo) -> Result<MusicQueue, ControlPointError> {
-        if info.capabilities().has_oh_playlist() {
+        let backend = if info.capabilities().has_oh_playlist() {
-            Ok(MusicQueue::OpenHome(OpenHomeQueue::from_renderer_info(
+            MusicQueueBackend::OpenHome(OpenHomeQueue::from_renderer_info(info)?)
-                info,
-            )?))
         } else {
-            Ok(MusicQueue::Internal(InternalQueue::from_renderer_info(
+            MusicQueueBackend::Internal(InternalQueue::from_renderer_info(info)?)
-                info,
+        };
-            )?))
+
+        Ok(MusicQueue {
+            backend,
+            sync_in_progress: Arc::new(AtomicBool::new(false)),
+            sync_pending: Arc::new(AtomicBool::new(false)),
+            sync_cancel_token: Arc::new(AtomicBool::new(false)),
+        })
+    }
+
+    /// Creates a MusicQueue from an InternalQueue backend.
+    pub fn from_internal(queue: InternalQueue) -> MusicQueue {
+        MusicQueue {
+            backend: MusicQueueBackend::Internal(queue),
+            sync_in_progress: Arc::new(AtomicBool::new(false)),
+            sync_pending: Arc::new(AtomicBool::new(false)),
+            sync_cancel_token: Arc::new(AtomicBool::new(false)),
         }
     }
+
+    /// Creates a MusicQueue from an OpenHomeQueue backend.
+    pub fn from_openhome(queue: OpenHomeQueue) -> MusicQueue {
+        MusicQueue {
+            backend: MusicQueueBackend::OpenHome(queue),
+            sync_in_progress: Arc::new(AtomicBool::new(false)),
+            sync_pending: Arc::new(AtomicBool::new(false)),
+            sync_cancel_token: Arc::new(AtomicBool::new(false)),
+        }
+    }
+
+    /// Returns true if this is an OpenHome backend.
+    pub fn is_openhome(&self) -> bool {
+        matches!(self.backend, MusicQueueBackend::OpenHome(_))
+    }
+
+    /// Returns a reference to the OpenHome queue if this is an OpenHome backend.
+    pub fn as_openhome(&self) -> Option<&OpenHomeQueue> {
+        match &self.backend {
+            MusicQueueBackend::OpenHome(q) => Some(q),
+            MusicQueueBackend::Internal(_) => None,
+        }
+    }
+
+    /// Returns a mutable reference to the OpenHome queue if this is an OpenHome backend.
+    pub fn as_openhome_mut(&mut self) -> Option<&mut OpenHomeQueue> {
+        match &mut self.backend {
+            MusicQueueBackend::OpenHome(q) => Some(q),
+            MusicQueueBackend::Internal(_) => None,
+        }
+    }
+
+    pub fn len(&self) -> Result<usize, ControlPointError> {
+        match &self.backend {
+            MusicQueueBackend::Internal(q) => q.len(),
+            MusicQueueBackend::OpenHome(q) => q.len(),
+        }
+    }
+
+    pub fn schedule_sync(
+        queue_arc: &Arc<Mutex<MusicQueue>>,
+        renderer_id: &str,
+        items: Vec<PlaybackItem>,
+        pending_items_fn: Box<
+            dyn Fn() -> Result<Vec<PlaybackItem>, ControlPointError> + Send + 'static,
+        >,
+        on_ready: Option<Box<dyn FnOnce() + Send + 'static>>,
+        on_complete: Box<dyn Fn(usize) + Send + 'static>,
+    ) -> SyncScheduleOutcome {
+        let (sync_in_progress, sync_pending, sync_cancel_token) = {
+            let q = queue_arc.lock().unwrap();
+            (
+                Arc::clone(&q.sync_in_progress),
+                Arc::clone(&q.sync_pending),
+                Arc::clone(&q.sync_cancel_token),
+            )
+        };
+
+        if sync_in_progress.swap(true, SeqCst) {
+            sync_cancel_token.store(true, SeqCst);
+            sync_pending.store(true, SeqCst);
+            return SyncScheduleOutcome::AlreadyRunning;
+        }
+
+        sync_cancel_token.store(false, SeqCst);
+        sync_pending.store(false, SeqCst);
+
+        let queue_arc = Arc::clone(queue_arc);
+        let thread_name = format!("queue-sync-{}", renderer_id);
+
+        thread::Builder::new()
+            .name(thread_name)
+            .spawn(move || {
+                struct Guard(Arc<AtomicBool>);
+                impl Drop for Guard {
+                    fn drop(&mut self) {
+                        self.0.store(false, SeqCst);
+                    }
+                }
+                let _guard = Guard(Arc::clone(&sync_in_progress));
+
+                let mut current_items = items;
+                let mut current_on_ready = Some(on_ready);
+                let mut on_complete = Some(on_complete);
+
+                tracing::debug!(thread = %std::thread::current().name().unwrap_or("?"), "queue-sync thread started");
+
+                loop {
+                    sync_pending.store(false, SeqCst);
+                    sync_cancel_token.store(false, SeqCst);
+
+                    // Extract the real on_ready BEFORE locking the queue.
+                    // on_ready may call play_from_queue() which re-locks the queue,
+                    // so we must NOT call it while holding queue_arc.
+                    let real_on_ready = current_on_ready.take().flatten();
+                    let on_ready_triggered = Arc::new(AtomicBool::new(false));
+                    let proxy_on_ready: Option<Box<dyn FnOnce() + Send + 'static>> =
+                        real_on_ready.as_ref().map(|_| {
+                            let flag = Arc::clone(&on_ready_triggered);
+                            Box::new(move || {
+                                flag.store(true, SeqCst);
+                            }) as Box<dyn FnOnce() + Send + 'static>
+                        });
+
+                    tracing::debug!(
+                        thread = %std::thread::current().name().unwrap_or("?"),
+                        items = current_items.len(),
+                        has_on_ready = real_on_ready.is_some(),
+                        "queue-sync: calling sync_queue"
+                    );
+
+                    let result = {
+                        let mut q = queue_arc.lock().unwrap();
+                        <MusicQueue as QueueBackend>::sync_queue(
+                            &mut q,
+                            current_items,
+                            &sync_cancel_token,
+                            proxy_on_ready,
+                        )
+                    };
+                    // Queue lock is released here.
+                    // Now safe to call on_ready (which may re-lock the queue).
+                    if on_ready_triggered.load(SeqCst) {
+                        tracing::debug!(
+                            thread = %std::thread::current().name().unwrap_or("?"),
+                            "queue-sync: on_ready triggered, calling callback"
+                        );
+                        if let Some(f) = real_on_ready {
+                            f();
+                        }
+                    } else if real_on_ready.is_some() {
+                        tracing::debug!(
+                            thread = %std::thread::current().name().unwrap_or("?"),
+                            "queue-sync: on_ready not triggered (cancelled or skipped)"
+                        );
+                    }
+
+                    match result {
+                        Err(ControlPointError::SyncCancelled) => {
+                            tracing::debug!(
+                                thread = %std::thread::current().name().unwrap_or("?"),
+                                "queue-sync: cancelled"
+                            );
+                        }
+                        Err(e) => {
+                            tracing::warn!("queue-sync error: {}", e);
+                        }
+                        Ok(()) => {
+                            tracing::debug!(
+                                thread = %std::thread::current().name().unwrap_or("?"),
+                                "queue-sync: completed successfully"
+                            );
+                            if let Some(cb) = on_complete.take() {
+                                let queue_len = queue_arc.lock().unwrap().len().unwrap_or(0);
+                                cb(queue_len);
+                            }
+                        }
+                    }
+
+                    if !sync_pending.load(SeqCst) {
+                        break;
+                    }
+
+                    match pending_items_fn() {
+                        Ok(new_items) => {
+                            current_items = new_items;
+                            current_on_ready = Some(None);
+                        }
+                        Err(e) => {
+                            tracing::warn!("queue-sync pending re-fetch error: {}", e);
+                            break;
+                        }
+                    }
+                }
+
+                tracing::debug!(thread = %std::thread::current().name().unwrap_or("?"), "queue-sync thread done");
+            })
+            .expect("Failed to spawn queue-sync thread");
+
+        SyncScheduleOutcome::Scheduled
+    }
 }
 
 impl QueueBackend for MusicQueue {
     // Primitives
     fn len(&self) -> Result<usize, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.len(),
+            MusicQueueBackend::Internal(q) => q.len(),
-            MusicQueue::OpenHome(q) => q.len(),
+            MusicQueueBackend::OpenHome(q) => q.len(),
         }
     }
 
     fn track_ids(&self) -> Result<Vec<u32>, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.track_ids(),
+            MusicQueueBackend::Internal(q) => q.track_ids(),
-            MusicQueue::OpenHome(q) => q.track_ids(),
+            MusicQueueBackend::OpenHome(q) => q.track_ids(),
         }
     }
 
     fn id_to_position(&self, id: u32) -> Result<usize, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.id_to_position(id),
+            MusicQueueBackend::Internal(q) => q.id_to_position(id),
-            MusicQueue::OpenHome(q) => q.id_to_position(id),
+            MusicQueueBackend::OpenHome(q) => q.id_to_position(id),
         }
     }
 
     fn position_to_id(&self, id: usize) -> Result<u32, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.position_to_id(id),
+            MusicQueueBackend::Internal(q) => q.position_to_id(id),
-            MusicQueue::OpenHome(q) => q.position_to_id(id),
+            MusicQueueBackend::OpenHome(q) => q.position_to_id(id),
         }
     }
 
     fn current_track(&self) -> Result<Option<u32>, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.current_track(),
+            MusicQueueBackend::Internal(q) => q.current_track(),
-            MusicQueue::OpenHome(q) => q.current_track(),
+            MusicQueueBackend::OpenHome(q) => q.current_track(),
         }
     }
 
     fn current_index(&self) -> Result<Option<usize>, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.current_index(),
+            MusicQueueBackend::Internal(q) => q.current_index(),
-            MusicQueue::OpenHome(q) => q.current_index(),
+            MusicQueueBackend::OpenHome(q) => q.current_index(),
         }
     }
 
     fn queue_snapshot(&self) -> Result<QueueSnapshot, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.queue_snapshot(),
+            MusicQueueBackend::Internal(q) => q.queue_snapshot(),
-            MusicQueue::OpenHome(q) => q.queue_snapshot(),
+            MusicQueueBackend::OpenHome(q) => q.queue_snapshot(),
         }
     }
 
     fn set_index(&mut self, index: Option<usize>) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.set_index(index),
+            MusicQueueBackend::Internal(q) => q.set_index(index),
-            MusicQueue::OpenHome(q) => q.set_index(index),
+            MusicQueueBackend::OpenHome(q) => q.set_index(index),
         }
     }
 
@@ -89,30 +302,35 @@ impl QueueBackend for MusicQueue {
         items: Vec<PlaybackItem>,
         current_index: Option<usize>,
     ) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.replace_queue(items, current_index),
+            MusicQueueBackend::Internal(q) => q.replace_queue(items, current_index),
-            MusicQueue::OpenHome(q) => q.replace_queue(items, current_index),
+            MusicQueueBackend::OpenHome(q) => q.replace_queue(items, current_index),
         }
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
-        match self {
+        &mut self,
-            MusicQueue::Internal(q) => q.sync_queue(items),
+        items: Vec<PlaybackItem>,
-            MusicQueue::OpenHome(q) => q.sync_queue(items),
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        match &mut self.backend {
+            MusicQueueBackend::Internal(q) => q.sync_queue(items, cancel_token, on_ready),
+            MusicQueueBackend::OpenHome(q) => q.sync_queue(items, cancel_token, on_ready),
         }
     }
 
     fn get_item(&self, index: usize) -> Result<Option<PlaybackItem>, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.get_item(index),
+            MusicQueueBackend::Internal(q) => q.get_item(index),
-            MusicQueue::OpenHome(q) => q.get_item(index),
+            MusicQueueBackend::OpenHome(q) => q.get_item(index),
         }
     }
 
     fn replace_item(&mut self, index: usize, item: PlaybackItem) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.replace_item(index, item),
+            MusicQueueBackend::Internal(q) => q.replace_item(index, item),
-            MusicQueue::OpenHome(q) => q.replace_item(index, item),
+            MusicQueueBackend::OpenHome(q) => q.replace_item(index, item),
         }
     }
 
@@ -121,59 +339,59 @@ impl QueueBackend for MusicQueue {
         items: Vec<PlaybackItem>,
         mode: EnqueueMode,
     ) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.enqueue_items(items, mode),
+            MusicQueueBackend::Internal(q) => q.enqueue_items(items, mode),
-            MusicQueue::OpenHome(q) => q.enqueue_items(items, mode),
+            MusicQueueBackend::OpenHome(q) => q.enqueue_items(items, mode),
         }
     }
 
     // Optimized helpers
     fn clear_queue(&mut self) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.clear_queue(),
+            MusicQueueBackend::Internal(q) => q.clear_queue(),
-            MusicQueue::OpenHome(q) => q.clear_queue(),
+            MusicQueueBackend::OpenHome(q) => q.clear_queue(),
         }
     }
 
     fn is_empty(&self) -> Result<bool, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.is_empty(),
+            MusicQueueBackend::Internal(q) => q.is_empty(),
-            MusicQueue::OpenHome(q) => q.is_empty(),
+            MusicQueueBackend::OpenHome(q) => q.is_empty(),
         }
     }
 
     fn upcoming_len(&self) -> Result<usize, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.upcoming_len(),
+            MusicQueueBackend::Internal(q) => q.upcoming_len(),
-            MusicQueue::OpenHome(q) => q.upcoming_len(),
+            MusicQueueBackend::OpenHome(q) => q.upcoming_len(),
         }
     }
 
     fn upcoming_items(&self) -> Result<Vec<PlaybackItem>, ControlPointError> {
-        match self {
+        match &self.backend {
-            MusicQueue::Internal(q) => q.upcoming_items(),
+            MusicQueueBackend::Internal(q) => q.upcoming_items(),
-            MusicQueue::OpenHome(q) => q.upcoming_items(),
+            MusicQueueBackend::OpenHome(q) => q.upcoming_items(),
         }
     }
 
     fn peek_current(&mut self) -> Result<Option<(PlaybackItem, usize)>, ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.peek_current(),
+            MusicQueueBackend::Internal(q) => q.peek_current(),
-            MusicQueue::OpenHome(q) => q.peek_current(),
+            MusicQueueBackend::OpenHome(q) => q.peek_current(),
         }
     }
 
     fn dequeue_next(&mut self) -> Result<Option<(PlaybackItem, usize)>, ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.dequeue_next(),
+            MusicQueueBackend::Internal(q) => q.dequeue_next(),
-            MusicQueue::OpenHome(q) => q.dequeue_next(),
+            MusicQueueBackend::OpenHome(q) => q.dequeue_next(),
         }
     }
 
     fn append_or_init_index(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
-        match self {
+        match &mut self.backend {
-            MusicQueue::Internal(q) => q.append_or_init_index(items),
+            MusicQueueBackend::Internal(q) => q.append_or_init_index(items),
-            MusicQueue::OpenHome(q) => q.append_or_init_index(items),
+            MusicQueueBackend::OpenHome(q) => q.append_or_init_index(items),
         }
     }
 }

pmocontrol/src/queue/openhome.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::sync::{Arc, Mutex};
+use std::sync::{atomic::AtomicBool, Arc, Mutex};
 use std::time::SystemTime;
 use std::usize;
 
@@ -544,32 +544,44 @@ impl OpenHomeQueue {
         &mut self,
         new_items: Vec<PlaybackItem>,
         playing_id: usize,
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: &mut Option<Box<dyn FnOnce() + Send>>,
     ) -> Result<(), ControlPointError> {
-        // Get current track IDs from OpenHome
+        use std::sync::atomic::Ordering::SeqCst;
+
         let current_track_ids = self.track_ids()?;
 
-        // Delete everything except the currently playing item
-        // Using delete_id_if_exists() to handle cases where another control point
-        // may have already modified the playlist
         for &track_id in current_track_ids.iter().rev() {
+            if cancel_token.load(SeqCst) {
+                return Err(ControlPointError::SyncCancelled);
+            }
             if track_id as usize != playing_id {
                 self.playlist_client.delete_id_if_exists(track_id)?;
                 self.metadata_cache.lock().unwrap().remove(&track_id);
             }
         }
 
-        // Insert new items after the currently playing track
         let mut previous_id = playing_id as u32;
+        let mut first_insert_done = false;
         for item in new_items {
+            if cancel_token.load(SeqCst) {
+                return Err(ControlPointError::SyncCancelled);
+            }
             let metadata = build_metadata_xml(&item);
             let new_id = self
                 .playlist_client
                 .insert(previous_id, &item.uri, &metadata)?;
 
-            // Enregistrer les métadonnées dans le cache
             self.cache_metadata(new_id, item.metadata, &item.uri);
 
             previous_id = new_id;
+
+            if !first_insert_done && on_ready.is_some() {
+                first_insert_done = true;
+                if let Some(f) = on_ready.take() {
+                    f();
+                }
+            }
         }
 
         debug!(
@@ -577,7 +589,6 @@ impl OpenHomeQueue {
             "Gentle sync completed: preserved playing track as first item (not in new playlist)"
         );
 
-        // Invalidate cache after playlist modifications
         self.invalidate_track_caches();
 
         Ok(())
@@ -589,8 +600,13 @@ impl OpenHomeQueue {
         old_ids: &[u32],
         keep_flags: &[bool],
         position_label: &str,
+        cancel_token: &Arc<AtomicBool>,
     ) -> Result<(), ControlPointError> {
+        use std::sync::atomic::Ordering::SeqCst;
         for (idx, &track_id) in old_ids.iter().enumerate().rev() {
+            if cancel_token.load(SeqCst) {
+                return Err(ControlPointError::SyncCancelled);
+            }
             if !keep_flags[idx] {
                 debug!(
                     renderer = self.renderer_id.0.as_str(),
@@ -615,8 +631,11 @@ impl OpenHomeQueue {
         keep_old_flags: &[bool],
         mut previous_id: u32,
         position_label: &str,
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: &mut Option<Box<dyn FnOnce() + Send>>,
     ) -> Result<u32, ControlPointError> {
-        // Collect IDs of kept items (in order)
+        use std::sync::atomic::Ordering::SeqCst;
+
         let remaining_ids: Vec<u32> = old_ids
             .iter()
             .enumerate()
@@ -624,15 +643,17 @@ impl OpenHomeQueue {
             .collect();
 
         let mut remaining_idx = 0;
+        let mut first_insert_done = false;
 
-        // Rebuild section
         for (idx, item) in new_items.iter().enumerate() {
+            if cancel_token.load(SeqCst) {
+                return Err(ControlPointError::SyncCancelled);
+            }
             if keep_new_flags[idx] {
                 let existing_id = remaining_ids[remaining_idx];
                 remaining_idx += 1;
                 previous_id = existing_id;
 
-                // Mettre à jour les métadonnées de l'item existant conservé
                 self.cache_metadata(existing_id, item.metadata.clone(), &item.uri);
 
                 debug!(
@@ -648,7 +669,6 @@ impl OpenHomeQueue {
                     .playlist_client
                     .insert(previous_id, &item.uri, &metadata)?;
 
-                // Enregistrer les métadonnées du nouvel item
                 self.cache_metadata(new_id, item.metadata.clone(), &item.uri);
 
                 debug!(
@@ -661,6 +681,13 @@ impl OpenHomeQueue {
                     new_id
                 );
                 previous_id = new_id;
+
+                if !first_insert_done && on_ready.is_some() {
+                    first_insert_done = true;
+                    if let Some(f) = on_ready.take() {
+                        f();
+                    }
+                }
             }
         }
 
@@ -677,6 +704,8 @@ impl OpenHomeQueue {
         pivot_id: usize,
         snapshot: &QueueSnapshot,
         current_track_ids: &[u32],
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: &mut Option<Box<dyn FnOnce() + Send>>,
     ) -> Result<(), ControlPointError> {
         // Find the pivot index in our current state
         let pivot_idx = current_track_ids
@@ -705,10 +734,15 @@ impl OpenHomeQueue {
         let (keep_old_before, keep_new_before) = lcs_flags_optimized(&old_before, new_before);
 
         // Delete items marked for deletion in AFTER part (reverse order)
-        self.delete_marked_items(&old_ids_after, &keep_old_after, "AFTER pivot")?;
+        self.delete_marked_items(&old_ids_after, &keep_old_after, "AFTER pivot", cancel_token)?;
 
         // Delete items marked for deletion in BEFORE part (reverse order)
-        self.delete_marked_items(&old_ids_before, &keep_old_before, "BEFORE pivot")?;
+        self.delete_marked_items(
+            &old_ids_before,
+            &keep_old_before,
+            "BEFORE pivot",
+            cancel_token,
+        )?;
 
         // Rebuild the playlist: [BEFORE, PIVOT, AFTER]
         // Rebuild BEFORE part (we don't need the returned previous_id)
@@ -719,6 +753,8 @@ impl OpenHomeQueue {
             &keep_old_before,
             OPENHOME_PLAYLIST_HEAD_ID,
             "BEFORE pivot",
+            cancel_token,
+            on_ready,
         )?;
 
         // PIVOT keeps its ID and position - it's the anchor point
@@ -748,6 +784,8 @@ impl OpenHomeQueue {
             &keep_old_after,
             previous_id,
             "AFTER pivot",
+            cancel_token,
+            on_ready,
         )?;
 
         debug!(
@@ -769,7 +807,11 @@ impl OpenHomeQueue {
         items: Vec<PlaybackItem>,
         snapshot: &QueueSnapshot,
         current_track_ids: &[u32],
+        cancel_token: &Arc<AtomicBool>,
+        on_ready: &mut Option<Box<dyn FnOnce() + Send>>,
     ) -> Result<(), ControlPointError> {
+        use std::sync::atomic::Ordering::SeqCst;
+
         debug!(
             renderer = self.renderer_id.0.as_str(),
             current_count = snapshot.items.len(),
@@ -795,32 +837,22 @@ impl OpenHomeQueue {
             "LCS computed: minimizing OpenHome playlist operations"
         );
 
-        // Get current playing track ID BEFORE any modifications
         let current_track_id = self.playlist_client.id().ok().filter(|&id| id != 0);
 
-        // Check if the currently playing track is in the new playlist
-        // If so, we should NOT use delete_all() - we must preserve it
         let current_track_in_new_playlist = current_track_id.and_then(|current_id| {
             items
                 .iter()
                 .position(|item| item.backend_id as u32 == current_id)
         });
 
-        // If we're replacing everything (keep=0), use delete_all() BUT only if
-        // there's no currently playing track, OR if the current track is not in the new playlist.
-        // If current track IS in new playlist, we must preserve it using insert/delete operations.
         if items_to_keep == 0 && items_to_delete > 0 {
             if current_track_in_new_playlist.is_some() {
-                // Current track is in new playlist - use insert/delete instead of delete_all
-                // to preserve playback
                 debug!(
                     renderer = self.renderer_id.0.as_str(),
                     current_track_in_playlist = true,
                     "Preserving currently playing track - using insert/delete instead of delete_all"
                 );
-                // Fall through to selective deletion below
             } else {
-                // No current track or not in new playlist - safe to use delete_all
                 debug!(
                     renderer = self.renderer_id.0.as_str(),
                     "Using delete_all() for complete replacement (safe - no current track or not in new playlist)"
@@ -829,19 +861,18 @@ impl OpenHomeQueue {
                 self.metadata_cache.lock().unwrap().clear();
             }
         } else {
-            // Selective deletion when keeping some items
             for idx in (0..current_track_ids.len()).rev() {
+                if cancel_token.load(SeqCst) {
+                    return Err(ControlPointError::SyncCancelled);
+                }
                 if !keep_current[idx] {
                     let track_id = current_track_ids[idx];
-                    // Use delete_id_if_exists() to handle cases where another control point
-                    // may have already modified the playlist
                     self.playlist_client.delete_id_if_exists(track_id)?;
                     self.metadata_cache.lock().unwrap().remove(&track_id);
                 }
             }
         }
 
-        // Rebuild by inserting new items
         let remaining_ids: Vec<u32> = current_track_ids
             .iter()
             .enumerate()
@@ -856,8 +887,12 @@ impl OpenHomeQueue {
 
         let mut remaining_idx = 0usize;
         let mut previous_id = OPENHOME_PLAYLIST_HEAD_ID;
+        let mut first_insert_done = false;
 
         for (idx, item) in items.into_iter().enumerate() {
+            if cancel_token.load(SeqCst) {
+                return Err(ControlPointError::SyncCancelled);
+            }
             if keep_desired[idx] {
                 if remaining_idx >= remaining_ids.len() {
                     return Err(ControlPointError::OpenHomeError(format!(
@@ -868,8 +903,6 @@ impl OpenHomeQueue {
                 remaining_idx += 1;
                 previous_id = existing_id;
 
-                // Mettre à jour les métadonnées de l'item existant conservé
-                // La fonction cache_metadata gère la protection contre la diminution de durée
                 self.cache_metadata(existing_id, item.metadata, &item.uri);
             } else {
                 let metadata = build_metadata_xml(&item);
@@ -877,10 +910,16 @@ impl OpenHomeQueue {
                     .playlist_client
                     .insert(previous_id, &item.uri, &metadata)?;
 
-                // Enregistrer les métadonnées du nouvel item
                 self.cache_metadata(new_id, item.metadata, &item.uri);
 
                 previous_id = new_id;
+
+                if !first_insert_done && on_ready.is_some() {
+                    first_insert_done = true;
+                    if let Some(f) = on_ready.take() {
+                        f();
+                    }
+                }
             }
         }
 
@@ -890,7 +929,6 @@ impl OpenHomeQueue {
             )));
         }
 
-        // Invalidate cache after playlist modifications
         self.invalidate_track_caches();
 
         Ok(())
@@ -1274,10 +1312,20 @@ impl QueueBackend for OpenHomeQueue {
         Ok(())
     }
 
-    fn sync_queue(&mut self, items: Vec<PlaybackItem>) -> Result<(), ControlPointError> {
+    fn sync_queue(
+        &mut self,
+        items: Vec<PlaybackItem>,
+        cancel_token: &Arc<AtomicBool>,
+        mut on_ready: Option<Box<dyn FnOnce() + Send>>,
+    ) -> Result<(), ControlPointError> {
+        use std::sync::atomic::Ordering::SeqCst;
+
         self.ensure_playlist_source_selected()?;
 
-        // DIAGNOSTIC: Log current track state before any modifications
+        if cancel_token.load(SeqCst) {
+            return Err(ControlPointError::SyncCancelled);
+        }
+
         let pre_current_track = self.playlist_client.id().ok();
         tracing::warn!(
             renderer = self.renderer_id.0.as_str(),
@@ -1293,10 +1341,8 @@ impl QueueBackend for OpenHomeQueue {
             );
             self.playlist_client.delete_all()?;
             self.metadata_cache.lock().unwrap().clear();
-            // Invalidate caches after delete_all (clears queue and current track)
             self.invalidate_all_caches();
 
-            // DIAGNOSTIC: Log state after delete_all
             let post_current_track = self.playlist_client.id().ok();
             tracing::warn!(
                 renderer = self.renderer_id.0.as_str(),
@@ -1306,8 +1352,6 @@ impl QueueBackend for OpenHomeQueue {
             return Ok(());
         }
 
-        // Fast path: try to detect simple append-only or delete-from-end patterns
-        // without the expensive ReadList call that queue_snapshot() would trigger
         match self.try_fast_path(&items) {
             FastPathResult::AppendOnly { new_items } => {
                 debug!(
@@ -1315,23 +1359,25 @@ impl QueueBackend for OpenHomeQueue {
                     new_items_count = new_items.len(),
                     "sync_queue: fast path - append-only detected"
                 );
-                // Insert new items at the end, using the returned new_id as after_id for next insert
-                // Start after the last existing track (cached, no SOAP call needed)
                 let current_ids = self.track_ids()?;
-                let mut after_id = current_ids.last().copied().unwrap_or(OPENHOME_PLAYLIST_HEAD_ID);
+                let mut after_id = current_ids
+                    .last()
+                    .copied()
+                    .unwrap_or(OPENHOME_PLAYLIST_HEAD_ID);
                 let mut uri_cache = self.uri_by_id.lock().unwrap();
                 for item in &new_items {
+                    if cancel_token.load(SeqCst) {
+                        return Err(ControlPointError::SyncCancelled);
+                    }
                     let metadata = build_metadata_xml(item);
                     let uri = item.uri.as_str();
                     let metadata_xml = metadata.as_str();
                     after_id = self.playlist_client.insert(after_id, uri, metadata_xml)?;
-                    // Update URI cache
                     if !item.uri.is_empty() {
                         uri_cache.insert(after_id, item.uri.clone());
                     }
                 }
                 drop(uri_cache);
-                // Invalidate caches after inserts
                 self.invalidate_track_caches();
                 return Ok(());
             }
@@ -1341,11 +1387,12 @@ impl QueueBackend for OpenHomeQueue {
                     delete_count = delete_ids.len(),
                     "sync_queue: fast path - delete-from-end detected"
                 );
-                // Delete items from the end
                 for id in delete_ids.iter().rev() {
+                    if cancel_token.load(SeqCst) {
+                        return Err(ControlPointError::SyncCancelled);
+                    }
                     self.playlist_client.delete_id(*id)?;
                 }
-                // Invalidate caches after deletes
                 self.invalidate_all_caches();
                 return Ok(());
             }
@@ -1357,9 +1404,6 @@ impl QueueBackend for OpenHomeQueue {
             }
         }
 
-        // Synchronize local state with the actual OpenHome playlist before computing
-        // differences. Without this, any drift between our cache and the renderer
-        // (e.g., manual edits from another control point) would keep the stale items.
         let snapshot = self.queue_snapshot()?;
 
         debug!(
@@ -1370,9 +1414,6 @@ impl QueueBackend for OpenHomeQueue {
             "sync_queue: snapshot vs new items comparison"
         );
 
-        // Note: current_index may point to an index that doesn't exist in items
-        // if the OpenHome renderer is in an inconsistent state (e.g., IdArray returns
-        // IDs but ReadList returns empty TrackList). We must bounds-check here.
         let playing_info = snapshot.current_index.and_then(|idx| {
             if idx < snapshot.items.len() {
                 Some((
@@ -1399,8 +1440,14 @@ impl QueueBackend for OpenHomeQueue {
             "OpenHome playlist state"
         );
 
+        let has_pivot = playing_info.is_some();
+        if has_pivot {
+            if let Some(f) = on_ready.take() {
+                f();
+            }
+        }
+
         if let Some((playing_idx, playing_id, playing_uri, playing_didl_id)) = playing_info {
-            // Find if the currently playing item is in the new playlist (by URI first, then by didl_id)
             let new_playing_idx = items
                 .iter()
                 .position(|item| item.uri == playing_uri)
@@ -1420,8 +1467,6 @@ impl QueueBackend for OpenHomeQueue {
             );
 
             if let Some(pivot_idx) = new_playing_idx {
-                // CASE 2: Currently playing item IS in the new playlist
-                // Use gentle double-LCS strategy: preserve the pivot and sync before/after separately
                 debug!(
                     renderer = self.renderer_id.0.as_str(),
                     playing_idx,
@@ -1438,22 +1483,24 @@ impl QueueBackend for OpenHomeQueue {
                     playing_id,
                     &snapshot,
                     &current_ids_for_pivot,
+                    cancel_token,
+                    &mut on_ready,
                 )?;
             } else {
-                // CASE 1: Currently playing item NOT in the new playlist
-                // Keep it as first item and append the new playlist after it
                 debug!(
                     renderer = self.renderer_id.0.as_str(),
                     playing_idx,
                     "Gentle sync: currently playing item not in new playlist, preserving as first item"
                 );
 
-                self.replace_queue_preserve_current(items, playing_id)?;
+                self.replace_queue_preserve_current(
+                    items,
+                    playing_id,
+                    cancel_token,
+                    &mut on_ready,
+                )?;
             }
         } else {
-            // No currently playing item or can't determine it - use standard LCS
-            // BUT first check if this is because the OpenHome device returned empty playlist
-            // This could cause the queue to be cleared incorrectly
             if snapshot.items.is_empty() && !items.is_empty() {
                 tracing::warn!(
                     renderer = self.renderer_id.0.as_str(),
@@ -1461,8 +1508,6 @@ impl QueueBackend for OpenHomeQueue {
                     new_items = items.len(),
                     "OpenHome playlist appears empty - possible stale cache or device issue, NOT clearing queue"
                 );
-                // Don't call replace_queue_standard_lcs with empty snapshot - it would clear our queue
-                // Instead, just add the new items without deleting existing ones
                 return self.enqueue_items(items, crate::queue::EnqueueMode::AppendToEnd);
             }
 
@@ -1472,10 +1517,15 @@ impl QueueBackend for OpenHomeQueue {
             );
             let current_ids_for_lcs: Vec<u32> =
                 snapshot.items.iter().map(|i| i.backend_id as u32).collect();
-            self.replace_queue_standard_lcs(items, &snapshot, &current_ids_for_lcs)?;
+            self.replace_queue_standard_lcs(
+                items,
+                &snapshot,
+                &current_ids_for_lcs,
+                cancel_token,
+                &mut on_ready,
+            )?;
         }
 
-        // DIAGNOSTIC: Log state after sync completes
         let post_current_track = self.playlist_client.id().ok();
         let post_ids = self.track_ids();
         tracing::warn!(
@@ -1694,6 +1744,6 @@ impl QueueFromRendererInfo for OpenHomeQueue {
     }
 
     fn to_backend(self) -> MusicQueue {
-        MusicQueue::OpenHome(self)
+        MusicQueue::from_openhome(self)
     }
 }

pmocontrol/src/queue/snapshot.rs

@@ -1,4 +1,4 @@
-use crate::{DeviceId, model::TrackMetadata};
+use crate::{model::TrackMetadata, DeviceId};
 
 /// Canonical representation of a track in a renderer queue.
 ///

pmocontrol/src/registry.rs

@@ -136,6 +136,14 @@ impl DeviceRegistry {
         self.devices.get(id)?.as_music_renderer().ok()
     }
 
+    pub fn get_renderer_queue_arc(
+        &self,
+        id: &DeviceId,
+    ) -> Option<std::sync::Arc<std::sync::Mutex<crate::queue::MusicQueue>>> {
+        let renderer = self.get_renderer(id)?;
+        Some(renderer.queue())
+    }
+
     pub fn get_server(&self, id: &DeviceId) -> Option<Arc<MusicServer>> {
         self.devices.get(id)?.as_music_server().ok()
     }

pmocontrol/src/sse.rs

@@ -153,6 +153,14 @@ pub enum RendererEventPayload {
         renderer_id: String,
         timestamp: chrono::DateTime<chrono::Utc>,
     },
+    QueueReadyToPlay {
+        renderer_id: String,
+        timestamp: chrono::DateTime<chrono::Utc>,
+    },
+    QueueSyncCancelled {
+        renderer_id: String,
+        timestamp: chrono::DateTime<chrono::Utc>,
+    },
     BindingChanged {
         renderer_id: String,
         server_id: Option<String>,
@@ -293,6 +301,14 @@ async fn renderer_event_to_payload(
             renderer_id: id.0,
             timestamp,
         },
+        RendererEvent::QueueReadyToPlay { id } => RendererEventPayload::QueueReadyToPlay {
+            renderer_id: id.0,
+            timestamp,
+        },
+        RendererEvent::QueueSyncCancelled { id } => RendererEventPayload::QueueSyncCancelled {
+            renderer_id: id.0,
+            timestamp,
+        },
         RendererEvent::BindingChanged { id, binding } => RendererEventPayload::BindingChanged {
             renderer_id: id.0,
             server_id: binding.as_ref().map(|b| b.server_id.0.clone()),

version.txt

@@ -1 +1 @@
-0.3.40
+0.3.41