fix: sửa lỗi xóa track khi nhấn phím Del, đúng là phải xóa items được chọn

app/static/js/app.jsx

@@ -531,7 +531,7 @@ const WaveformLane = ({
 
         // 1. Draw Clip Layer Background & Border
         const clipIdentifier = clip.id === 'default' ? 'default_' + track.id : clip.id;
-        const isClipSelected = selectedClipId && selectedClipId.trackId === track.id && selectedClipId.clipId === clipIdentifier;
+        const isClipSelected = (selectedClipId && selectedClipId.trackId === track.id && selectedClipId.clipId === clipIdentifier) || (selectedItemIds && selectedItemIds.has(clipIdentifier));
         ctx.fillStyle = clip.isTemp ? 'rgba(239, 68, 68, 0.25)' : isClipSelected ? track.color ? track.color + '44' : 'rgba(6, 182, 212, 0.30)' : track.color ? track.color + '22' : 'rgba(6, 182, 212, 0.12)';
         ctx.strokeStyle = clip.isTemp ? '#ef4444' : isClipSelected ? '#fbbf24' : track.color || '#06b6d4';
         ctx.lineWidth = isClipSelected ? 1 : 1.5;
@@ -7731,26 +7731,49 @@ const App = () => {
         if (idsToDelete.has(m.id)) { changed = true; return false; }
         return true;
       });
-      const clips = (t.clips || []).filter(c => {
+      let clips = t.clips || [];
+      const hasVirtualClip = !t.clips || t.clips.length === 0;
+      if (hasVirtualClip && t.buffer) {
+        const canonical = 'default_' + t.id;
+        if (idsToDelete.has(canonical)) {
+          changed = true;
+          return {
+            ...t,
+            sections,
+            midiItems,
+            clips: [],
+            buffer: null,
+            startTime: 0
+          };
+        }
+      }
+      const updatedClips = clips.filter(c => {
         const canonical = c.id === 'default' ? 'default_' + t.id : c.id;
         if (idsToDelete.has(canonical)) { changed = true; return false; }
         return true;
       });
-      if (!changed) return t;
+      if (!changed && sections.length === (t.sections || []).length && midiItems.length === (t.midiItems || []).length) {
+        return t;
+      }
       return {
         ...t,
         sections,
         midiItems,
-        clips,
+        clips: updatedClips,
-        buffer: clips[0]?.buffer || null,
+        buffer: updatedClips.length > 0 ? updatedClips[0].buffer : null,
-        startTime: clips[0]?.startTime || 0,
+        startTime: updatedClips.length > 0 ? updatedClips[0].startTime : 0,
-        name: clips[0]?.name || t.name
+        name: updatedClips.length > 0 ? updatedClips[0].name : t.name
       };
     }));
     showToast(count === 1 ? 'Đã xóa 1 item.' : `Đã xóa ${count} items.`, 'info');
   };
   const selectedClipIdRef = useRef(null);
   selectedClipIdRef.current = selectedClipId;
+  const selectedTrackIdRef = useRef(selectedTrackId);
+  selectedTrackIdRef.current = selectedTrackId;
+  const handleDeleteTrackRef = useRef(() => {});
+  const handleSplitTrackRef = useRef(() => {});
+  const handleRecordClickRef = useRef(() => {});
   const activeTabRef = useRef(activeTab);
   activeTabRef.current = activeTab;
   const activePlaybackSpeedRef = useRef(1.0);
@@ -8009,8 +8032,8 @@ const App = () => {
       // Global space play/pause shortcut for transport
       if (e.key === ' ' || e.code === 'Space') {
         e.preventDefault();
-        if (recordingState === 'RECORDING' || recordingState === 'COUNT_IN') {
+        if (recordingStateRef.current === 'RECORDING' || recordingStateRef.current === 'COUNT_IN') {
-          handleRecordClick();
+          handleRecordClickRef.current();
           return;
         }
         if (handlePlayPauseRef.current) handlePlayPauseRef.current();
@@ -8135,7 +8158,14 @@ const App = () => {
         (activeTracksRef.current || []).forEach(t => {
           (t.sections || []).forEach(s => allIds.add(s.id));
           (t.midiItems || []).forEach(m => allIds.add(m.id));
-          (t.clips || []).forEach(c => allIds.add(c.id === 'default' ? 'default_' + t.id : c.id));
+          const clips = t.clips && t.clips.length > 0 ? t.clips : t.buffer ? [{
+            id: 'default',
+            buffer: t.buffer,
+            startTime: t.startTime || 0,
+            name: t.name,
+            speed: t.speed || 1.0
+          }] : [];
+          clips.forEach(c => allIds.add(c.id === 'default' ? 'default_' + t.id : c.id));
         });
         setSelectedItemIds(allIds);
         return;
@@ -8234,7 +8264,7 @@ const App = () => {
           return;
         } else {
           e.preventDefault();
-          handleDeleteTrack();
+          handleDeleteTrackRef.current();
           return;
         }
       }
@@ -8285,7 +8315,7 @@ const App = () => {
       }
       if (!ctrl && !alt && e.key === 's') {
         e.preventDefault();
-        handleSplitTrack(selectedTrackId);
+        handleSplitTrackRef.current(selectedTrackIdRef.current);
         return;
       }
     };
@@ -9705,6 +9735,7 @@ const App = () => {
     }
     showToast('Deleted track.', 'info');
   };
+  handleDeleteTrackRef.current = handleDeleteTrack;
 
   // ── Server Health Check ──
   const [viewportWidth, setViewportWidth] = useState(1200);
@@ -10943,6 +10974,7 @@ const App = () => {
       setRecordingState('IDLE');
     }
   };
+  handleRecordClickRef.current = handleRecordClick;
 
   const startRecordingTake = async (armedTracks) => {
     const context = getAudioContext();
@@ -14120,6 +14152,7 @@ const App = () => {
   const handleSplitTrack = trackId => {
     handleSplitTrackAtTime(trackId, null, currentTime);
   };
+  handleSplitTrackRef.current = handleSplitTrack;
 
   // ── Glue (Merge) Clips on Selected Track ──
   const handleGlueTracks = () => {

wiki.md

@@ -664,3 +664,9 @@
 - **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js`
 - **Ghi chú/Test (nếu có):** `npm run build` pass. Mở SECTION-TAB → PIANO_ROLL → Synth → chọn instrument → verify instrument được áp dụng cho section track (không phải main track).
 ---
+
+### [2026-07-28 18:17] Task: Keyboard shortcuts Ctrl+A select all + Del delete selected items/groups
+- **Tóm tắt thay đổi:** (1) Ctrl+A đã tồn tại để chọn tất cả items trên timeline. (2) Thêm xử lý phím Delete/Backspace cho `selectedItemIds`: xóa tất cả section, MIDI item, và audio clip đang được chọn khỏi track, xóa selection, hiện toast thông báo.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`
+- **Ghi chú/Test (nếu có):** Build có lỗi parse pre-existing (Babel 8) không liên quan đến thay đổi này.
+---