fix(v8): 5 bugs — orphan bridge watchdog+state overwrite, stuck-note stop race, white VST GUI retry, VSTi auto-load via saved plugin_path, track-header button overflow

- native bridge: dedicated watchdog thread (parent death / PID-reuse via GetProcessTimes) -> TerminateProcess self; transportStopped flag drops note-on after STOP + CC64 sustain release + allNotesOff on stop
- tauri: set_bridge_child overwrites managed BridgeProcess state (app.manage is no-op when state exists) so Destroyed handler kills restarted bridge
- ui: stopAllPlayback syncs isPlayingRef/subTabsRef + second transport stop at 150ms; onStatusChange resets __bridgeLoadedChannels at callback start (auto-restart never emits bridge-down); openVstGuiRetry waits for async C++ load before OPEN_GUI; loadVstToBridge uses synth_engine.plugin_path / listPlugins fallback and persists plugin_path on load; shrink track-header Synth/GUI buttons

app/static/js/app.jsx

@@ -6175,8 +6175,25 @@ const loadVstToBridge = async (track) => {
   const bch = window.SonicMidiRouter.allocateChannel(track.id, false);
   if (window.__bridgeLoadedChannels[bch]) return true;
   try {
-    const r = await window.SonicAPI.bridgeLoad({ name: instrumentId, path: null, instrumentType: 'VST3', channel: bch });
+    // V8 bug 5: engine _resolve_bridge_asset chi match FILE theo filename —
-    const p = r && r.path ? r.path : null;
+    // KHONG walk folder VST3 ("X.vst3/X.vst3.dll") → 404. Dung path da luu
+    // (synth_engine.plugin_path) hoac cache tu listPlugins.
+    let knownPath = track.synth_engine && track.synth_engine.plugin_path;
+    if (!knownPath && window.__bridgePluginPaths) knownPath = window.__bridgePluginPaths[instrumentId];
+    const r = await window.SonicAPI.bridgeLoad({ name: instrumentId, path: knownPath || null, instrumentType: 'VST3', channel: bch });
+    let p = r && r.path ? r.path : null;
+    if (!p && knownPath) p = knownPath;
+    if (!p && window.SonicAPI.listPlugins) {
+      try {
+        const pl = await window.SonicAPI.listPlugins();
+        const v = ((pl && pl.vst_instruments) || []).find(x => x.id === instrumentId || x.name === instrumentId);
+        if (v && v.path) {
+          p = v.path;
+          if (!window.__bridgePluginPaths) window.__bridgePluginPaths = {};
+          window.__bridgePluginPaths[instrumentId] = v.path;
+        }
+      } catch (e2) { console.warn('[Bridge] listPlugins fallback fail:', e2); }
+    }
     if (!p) return false;
     const ok = await window.NativeBridgeService.loadInstrument(p, 'VST3', bch);
     if (ok) window.__bridgeLoadedChannels[bch] = true;
@@ -6193,7 +6210,17 @@ const ensureAndOpenVstGui = async (trackId, instrumentId) => {
     const ok = await loadVstToBridge({ id: trackId, instrumentId });
     if (!ok) return;
   }
-  try { await window.NativeBridgeService.openNativeGUI(instrumentId, bch); } catch (e) { console.warn('[Bridge] openNativeGUI fail:', e); }
+  try { await openVstGuiRetry(instrumentId, bch, 5); } catch (e) { console.warn('[Bridge] openNativeGUI fail:', e); }
+};
+// V8 bug 4: C++ load instrument ASYNC (worker thread) — OPEN_GUI gui toi truoc
+// khi assign() xong → instruments.get(guiCh) null → "GUI attach FAILED" →
+// nen trang. Retry mo GUI nhieu lan, cach 400ms cho load xong.
+const openVstGuiRetry = async (instrumentId, bch, attempts) => {
+  for (let i = 0; i < (attempts || 5); i++) {
+    try { await window.NativeBridgeService.openNativeGUI(instrumentId, bch); return true; } catch (e) { console.warn('[Bridge] openNativeGUI retry', i + 1, e); }
+    await new Promise(r => setTimeout(r, 400));
+  }
+  return false;
 };
 // Module-level so both ProfileModal (open project) and App (auto-restore) can
 // warm the FluidSynth font cache for each track's instrument. This only loads
@@ -15473,10 +15500,17 @@ const App = () => {
           Object.keys(window.__bridgeLastProgram).forEach(k => { if (k.indexOf(_pfx) === 0) delete window.__bridgeLastProgram[k]; });
         }
         if (ok) { if (!window.__bridgeLoadedChannels) window.__bridgeLoadedChannels = {}; window.__bridgeLoadedChannels[bch] = true; }
+        if (ok && btype === 'VST3' && p) {
+          try {
+            if (!window.__bridgePluginPaths) window.__bridgePluginPaths = {};
+            window.__bridgePluginPaths[instrumentId] = p;
+            updateActiveTracks(prev => prev.map(t => t.id === trackId ? { ...t, synth_engine: { ...(t.synth_engine || {}), plugin_path: p } } : t));
+          } catch (e) {}
+        }
         // Requirement 2: chọn VST3 qua nút Synth → load xong mở native GUI
         // (C++ attach editor vào cửa sổ bridge tự tạo — control type=4, hwnd=0).
         if (ok && btype === 'VST3' && window.NativeBridgeService.openNativeGUI) {
-          try { await window.NativeBridgeService.openNativeGUI(instrumentId, bch); } catch (e) {}
+          try { await openVstGuiRetry(instrumentId, bch, 5); } catch (e) {}
         }
       }
     })();
@@ -17059,6 +17093,10 @@ const App = () => {
     if (!window.NativeBridgeService) return;
     setBridgeUi(s => ({ ...s, connected: !!window.NativeBridgeService.isBridgeConnected }));
     window.NativeBridgeService.onStatusChange(function (st) {
+      // V8 bug 4: reset map NGAY DAU callback (ca connected lan !connected) —
+      // Rust auto-restart KHONG emit bridge-down khi thanh cong → map cu true →
+      // GUI click skip load → attach null → nen trang.
+      window.__bridgeLoadedChannels = {};
       setBridgeUi(s => ({ ...s, connected: !!st.connected }));
       if (!st.connected) {
         // Bridge down/restart → C++ mất hết instrument → reset map để lần tới
@@ -22461,6 +22499,8 @@ const App = () => {
   };
   const stopAllPlayback = () => {
     try {
+    isPlayingRef.current = false;
+    try { if (subTabsRef.current) subTabsRef.current = subTabsRef.current.map(s => ({ ...s, isPlaying: false })); } catch (e) {}
     activeSourcesRef.current.forEach(src => {
       try {
         src.stop();
@@ -22484,6 +22524,9 @@ const App = () => {
     // ngân tức thì; A13 C++ flush note-off).
     if (window.NativeBridgeService && window.NativeBridgeService.isBridgeConnected) {
       try { window.NativeBridgeService.transport('stop'); } catch (e) {}
+      // V8 bug 3: transport stop thu 2 sau 150ms — note-on timer guard sync qua
+      // React effect (cham) van bay toi bridge sau STOP → retrigger am treo.
+      setTimeout(() => { try { window.NativeBridgeService.transport('stop'); } catch (e) {} }, 150);
     }
     if (window.SonicSF) {
       try { window.SonicSF.stopAll(); } catch (e) { console.warn('[Stop] stopAll error:', e); }
@@ -29797,20 +29840,20 @@ STRICT CONSTRAINTS:
         className: "text-zinc-500 font-normal"
       }, track.fxType || "None")), /*#__PURE__*/React.createElement("button", {
         onClick: (e) => { e.stopPropagation(); openInstrumentSelector(track.id); },
-        className: "px-2.5 py-1 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-xs font-bold flex items-center gap-1 max-w-[120px]"
+        className: "px-1.5 py-0.5 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-[10px] font-bold flex items-center gap-1 max-w-[70px] shrink-0"
       }, /*#__PURE__*/React.createElement("span", {
         className: "inline-flex items-center shrink-0"
       }, /*#__PURE__*/React.createElement("i", {
         "data-lucide": "music",
-        className: "w-3 h-3"
+        className: "w-2.5 h-2.5 shrink-0"
-      })), /*#__PURE__*/React.createElement("span", { className: "truncate text-[10px]" }, track.instrumentName || track.instrumentId || "Synth"), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-3 h-3 shrink-0" }))), (track.instrumentId && typeof track.instrumentId === 'string' && !track.instrumentId.startsWith('sf_') ? /*#__PURE__*/React.createElement("button", {
+      })), /*#__PURE__*/React.createElement("span", { className: "truncate text-[10px] min-w-0" }, track.instrumentName || track.instrumentId || "Synth"), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-3 h-3 shrink-0" }))), (track.instrumentId && typeof track.instrumentId === 'string' && !track.instrumentId.startsWith('sf_') ? /*#__PURE__*/React.createElement("button", {
         onClick: (e) => {
           e.stopPropagation();
           ensureAndOpenVstGui(track.id, track.instrumentId);
         },
         title: "Mở lại GUI VSTi",
-        className: "px-1.5 py-1 bg-zinc-800 hover:bg-zinc-700 text-violet-300 border border-violet-800 rounded text-[10px] font-bold flex items-center gap-1 shrink-0"
+        className: "px-1 py-0.5 bg-zinc-800 hover:bg-zinc-700 text-violet-300 border border-violet-800 rounded text-[9px] font-bold flex items-center gap-0.5 shrink-0"
-      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "sliders-horizontal", className: "w-3 h-3 shrink-0" }), /*#__PURE__*/React.createElement("span", { className: "truncate text-[9px]" }, "GUI")) : null), /*#__PURE__*/React.createElement("div", {
+      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "sliders-horizontal", className: "w-2.5 h-2.5 shrink-0" }), /*#__PURE__*/React.createElement("span", { className: "truncate text-[8px] min-w-0" }, "GUI")) : null), /*#__PURE__*/React.createElement("div", {
         onMouseDown: e => handleTrackResizeMouseDown(e, track.id),
         className: "absolute bottom-0 left-0 right-0 h-1 cursor-ns-resize z-30 hover:bg-cyan-500/50 transition-colors",
         onClick: e => e.stopPropagation()

app/templates/index.html

@@ -50,7 +50,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608132011" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608132130" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {

native_bridge/src/main.cpp

@@ -209,6 +209,37 @@ int main(int argc, char* argv[]) {
     uint32_t parentPid = 0;
     if (const char* e = std::getenv("SF_PARENT_PID")) parentPid = (uint32_t)std::atoi(e);
 
+    // V8 bug 2: watchdog THREAD rieng - main loop chi check parent_alive giua
+    // cac block; neu VST process() chan loop thi khong bao gio thoat -> orphan.
+    // Thread nay chay doc lap, parent chet -> TerminateProcess ngay. Kem
+    // start-time check chong PID reuse (OpenProcess tra handle cua process
+    // khac chiem lai PID -> tuong parent con song mai).
+    if (parentPid != 0) {
+        std::thread([parentPid]() {
+            auto proc_birth = [](HANDLE h) -> uint64_t {
+                FILETIME c, e, k, u;
+                if (GetProcessTimes(h, &c, &e, &k, &u))
+                    return (uint64_t(c.dwHighDateTime) << 32) | c.dwLowDateTime;
+                return 0;
+            };
+            uint64_t birth = 0;
+            {
+                HANDLE h = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, parentPid);
+                if (h) { birth = proc_birth(h); CloseHandle(h); }
+            }
+            for (;;) {
+                Sleep(2000);
+                HANDLE h = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, parentPid);
+                if (!h) { TerminateProcess(GetCurrentProcess(), 0); return; }
+                uint64_t nowBirth = proc_birth(h);
+                CloseHandle(h);
+                if (birth != 0 && nowBirth != 0 && nowBirth != birth) {
+                    TerminateProcess(GetCurrentProcess(), 0); return;
+                }
+            }
+        }).detach();
+    }
+
 #ifdef _WIN32
     // Real-time-ish timing: 1ms scheduler resolution
     timeBeginPeriod(1);
@@ -252,6 +283,10 @@ int main(int argc, char* argv[]) {
     }
     const uint32_t block = AUDIO_BLOCK_SIZE;
     uint64_t playheadSamples = 0;
+    // V8 bug 3: khi STOP da xu ly, bo qua NOTE_ON (velocity>0) den sau - JS
+    // note-on timer co the bay toi sau STOP (guardPlay tre do React re-render)
+    // -> retrigger note -> VST loop am. Chi PLAY moi nhan note-on lai.
+    bool transportStopped = false;
 
     auto dispatch = [&](const SharedAudioBufferIPC::MidiEventIPC& evt) {
         auto* inst = instruments.get(evt.channel);
@@ -261,9 +296,10 @@ int main(int argc, char* argv[]) {
                 // sampleOffset LUON LUON = 0 khi den day: events duoc dispatch ngay
                 // truoc segment chua no (A11 splitting), nen offset tuong doi la 0.
                 // Truyen offset tuyet doi truoc day lam sfizz/VST3 trigger tre.
-                if (evt.velocity > 0)
+                if (evt.velocity > 0) {
+                    if (transportStopped) return; // V8 bug 3: drop note-on sau STOP
                     inst->noteOn(evt.channel, evt.pitch, evt.velocity / 127.0f, 0);
-                else
+                } else
                     inst->noteOff(evt.channel, evt.pitch, 0);
                 break;
             case 0x8:
@@ -363,9 +399,17 @@ int main(int argc, char* argv[]) {
                 std::cout << "[NativeBridge] PANIC — all notes off" << std::endl;
             } else if (c.type == 3) { // TRANSPORT (A13)
                 if (c.arg0 == 0) { // STOP → flush every note immediately
+                    transportStopped = true;
+                    // Release sustain pedal TRUOC (CC64=0) — nhieu VSTi giu note
+                    // khi pedal con down -> note-off cua allNotesOff bi bo qua
+                    // -> am treo loop (V8 bug 3).
+                    for (uint32_t ch = 0; ch < 16; ++ch) {
+                        if (auto* inst = instruments.get(ch)) inst->controlChange(ch, 64, 0);
+                    }
                     instruments.allNotesOff();
                     std::cout << "[NativeBridge] transport STOP — all notes off" << std::endl;
                 } else if (c.arg0 == 1) { // PLAY
+                    transportStopped = false;
                     playheadSamples = c.arg1;
                     std::cout << "[NativeBridge] transport PLAY playhead=" << playheadSamples << std::endl;
                 } else if (c.arg0 == 2) { // SET_POSITION (seek while stopped)

src-tauri/src/lib.rs

@@ -24,6 +24,20 @@ struct EngineProcess(Mutex<Option<CommandChild>>);
 struct BridgeProcess(Mutex<Option<CommandChild>>);
 struct BridgeSampleRate(Mutex<u32>);
 
+/// Overwrite the managed bridge child. `app.manage` is a NO-OP once the state
+/// exists (StateManager::set keeps the first value), so restarts would leave
+/// the state at None and the Destroyed handler would never kill the new
+/// bridge — orphan daw_vst_bridge.exe. First call still uses manage().
+fn set_bridge_child(app: &AppHandle, child: Option<CommandChild>) {
+    if let Some(state) = app.try_state::<BridgeProcess>() {
+        if let Ok(mut g) = state.0.lock() {
+            *g = child;
+        }
+    } else {
+        app.manage(BridgeProcess(Mutex::new(child)));
+    }
+}
+
 /// Kill the currently managed bridge child (if any) — a restart MUST never
 /// leave the old bridge running, else two daw_vst_bridge.exe race on the same
 /// SHM (double instrument load, double OPEN_GUI, garbled control queue).
@@ -145,7 +159,7 @@ fn spawn_bridge(
                 .spawn()
             {
                 Ok((mut rx, child)) => {
-                    app.manage(BridgeProcess(Mutex::new(Some(child))));
+                    set_bridge_child(app, Some(child));
                     // B3: redirect bridge stdout/stderr → %APPDATA%/SonicForgeDAW/logs/bridge.log
                     // (tauri-shell pipe rồi vứt rx; đọc event ghi file — E5 UI tail được).
                     let log_dir = std::env::var("APPDATA").unwrap_or_else(|_| ".".into());
@@ -175,14 +189,14 @@ fn spawn_bridge(
                 }
                 Err(e) => {
                     println!("Failed to spawn daw_vst_bridge {bridge_exe:?}: {e}");
-                    app.manage(BridgeProcess(Mutex::new(None)));
+                    set_bridge_child(app, None);
                     false
                 }
             }
         }
         None => {
             println!("daw_vst_bridge binary not found — app will use WASM fallback");
-            app.manage(BridgeProcess(Mutex::new(None)));
+            set_bridge_child(app, None);
             false
         }
     }