fix: skip st.notes sync when draggedNote active (prevents brush flicker)

app/static/js/app.jsx

@@ -4572,6 +4572,8 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
   const noteMaxBeat = (st.notes || []).reduce((max, n) => Math.max(max, (n.start_beat || 0) + (n.duration_beats || 1)), 0);
   const [selectionMarquee, setSelectionMarquee] = React.useState(null); // { startBeat, startPitch, currentBeat, currentPitch }
   const [draggedNote, setDraggedNote] = React.useState(null); // { mode: 'move'|'resize', idx, startOffsetBeat, originalStart }
+  const draggedNoteRef = React.useRef(draggedNote);
+  draggedNoteRef.current = draggedNote;
   const [hoveredResizeIdx, setHoveredResizeIdx] = React.useState(-1);
   const [rollBeats, setRollBeats] = React.useState(Math.max(noteMaxBeat + 16, 64));
   const rollBeatsRef = React.useRef(rollBeats);
@@ -4585,7 +4587,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, onClose, onUpdateNot
   const [notes, setNotes] = React.useState(st.notes || []);
   const notesRef = React.useRef(notes);
   notesRef.current = notes;
-  React.useEffect(() => { setNotes(st.notes || []); }, [st.notes]);
+  React.useEffect(() => { if (!draggedNoteRef.current) setNotes(st.notes || []); }, [st.notes]);
   const brushVelocityRef = React.useRef(0.8);
   const [selectedNoteIds, setSelectedNoteIds] = React.useState([]);
   React.useEffect(() => {

app/static/js/app.precompiled.js

@@ -131,8 +131,8 @@ const[formName,setFormName]=React.useState('');const[formKeywords,setFormKeyword
 const[aiBarStart,setAiBarStart]=React.useState(0);const[aiBarEnd,setAiBarEnd]=React.useState(4);const canvasRef=React.useRef(null);const ccCanvasRef=React.useRef(null);const ccWrapperRef=React.useRef(null);const gridScrollRef=React.useRef(null);const keybedRef=React.useRef(null);const keybedMouseDownRef=React.useRef(false);const rulerScrollRef=React.useRef(null);React.useEffect(()=>{const up=()=>{keybedMouseDownRef.current=false;};window.addEventListener('mouseup',up);return()=>window.removeEventListener('mouseup',up);},[]);const NoteHeight=18;const PITCH_START=0;// C0 (render all 128 keys)
 const KeybedPixelHeight=(128-PITCH_START)*NoteHeight;const pixelsPerBeat=rollZoom;const timeSigNum=4;const noteMaxBeat=(st.notes||[]).reduce((max,n)=>Math.max(max,(n.start_beat||0)+(n.duration_beats||1)),0);const[selectionMarquee,setSelectionMarquee]=React.useState(null);// { startBeat, startPitch, currentBeat, currentPitch }
 const[draggedNote,setDraggedNote]=React.useState(null);// { mode: 'move'|'resize', idx, startOffsetBeat, originalStart }
-const[hoveredResizeIdx,setHoveredResizeIdx]=React.useState(-1);const[rollBeats,setRollBeats]=React.useState(Math.max(noteMaxBeat+16,64));const rollBeatsRef=React.useRef(rollBeats);rollBeatsRef.current=rollBeats;const totalBeats=Math.max(rollBeats,noteMaxBeat+16,64);// at least 64 beats (16 bars) for scrolling
+const draggedNoteRef=React.useRef(draggedNote);draggedNoteRef.current=draggedNote;const[hoveredResizeIdx,setHoveredResizeIdx]=React.useState(-1);const[rollBeats,setRollBeats]=React.useState(Math.max(noteMaxBeat+16,64));const rollBeatsRef=React.useRef(rollBeats);rollBeatsRef.current=rollBeats;const totalBeats=Math.max(rollBeats,noteMaxBeat+16,64);// at least 64 beats (16 bars) for scrolling
-const drawWidth=totalBeats*pixelsPerBeat;const[rollViewWidth,setRollViewWidth]=React.useState(800);const viewWidth=Math.max(drawWidth,rollViewWidth);const viewBeats=Math.ceil(viewWidth/pixelsPerBeat)+4;const[notes,setNotes]=React.useState(st.notes||[]);const notesRef=React.useRef(notes);notesRef.current=notes;React.useEffect(()=>{setNotes(st.notes||[]);},[st.notes]);const brushVelocityRef=React.useRef(0.8);const[selectedNoteIds,setSelectedNoteIds]=React.useState([]);React.useEffect(()=>{const handler=e=>{if((e.ctrlKey||e.metaKey)&&e.key==='a'){const target=e.target;if(target&&(target.tagName==='INPUT'||target.tagName==='TEXTAREA'||target.isContentEditable))return;e.preventDefault();setSelectedNoteIds(notes.map(n=>n.id));}};window.addEventListener('keydown',handler);return()=>window.removeEventListener('keydown',handler);},[notes,setSelectedNoteIds]);// Undo/redo stacks
+const drawWidth=totalBeats*pixelsPerBeat;const[rollViewWidth,setRollViewWidth]=React.useState(800);const viewWidth=Math.max(drawWidth,rollViewWidth);const viewBeats=Math.ceil(viewWidth/pixelsPerBeat)+4;const[notes,setNotes]=React.useState(st.notes||[]);const notesRef=React.useRef(notes);notesRef.current=notes;React.useEffect(()=>{if(!draggedNoteRef.current)setNotes(st.notes||[]);},[st.notes]);const brushVelocityRef=React.useRef(0.8);const[selectedNoteIds,setSelectedNoteIds]=React.useState([]);React.useEffect(()=>{const handler=e=>{if((e.ctrlKey||e.metaKey)&&e.key==='a'){const target=e.target;if(target&&(target.tagName==='INPUT'||target.tagName==='TEXTAREA'||target.isContentEditable))return;e.preventDefault();setSelectedNoteIds(notes.map(n=>n.id));}};window.addEventListener('keydown',handler);return()=>window.removeEventListener('keydown',handler);},[notes,setSelectedNoteIds]);// Undo/redo stacks
 const undoStackRef=React.useRef([]);const redoStackRef=React.useRef([]);const notesBeforeDragRef=React.useRef(null);const pushToUndo=React.useCallback(prevNotes=>{undoStackRef.current.push(JSON.parse(JSON.stringify(prevNotes)));redoStackRef.current=[];if(undoStackRef.current.length>50)undoStackRef.current.shift();},[]);const handleUndo=React.useCallback(()=>{const prev=undoStackRef.current.pop();if(!prev)return;redoStackRef.current.push(JSON.parse(JSON.stringify(notes)));setNotes(prev);setSelectedNoteIds([]);},[notes]);const handleRedo=React.useCallback(()=>{const next=redoStackRef.current.pop();if(!next)return;undoStackRef.current.push(JSON.parse(JSON.stringify(notes)));setNotes(next);setSelectedNoteIds([]);},[notes]);React.useEffect(()=>{const handler=e=>{if((e.ctrlKey||e.metaKey)&&e.key==='z'&&!e.shiftKey){e.preventDefault();handleUndo();}else if((e.ctrlKey||e.metaKey)&&(e.key==='y'||e.key==='z'&&e.shiftKey)){e.preventDefault();handleRedo();}else if(e.key==='Delete'||e.key==='Backspace'){if(selectedNoteIds.length>0&&e.target.tagName!=='INPUT'&&e.target.tagName!=='TEXTAREA'){e.preventDefault();pushToUndo(notes);setNotes(prev=>prev.filter(n=>!selectedNoteIds.includes(n.id)));setSelectedNoteIds([]);showToast(`Đã xóa ${selectedNoteIds.length} nốt!`,'info');}}};window.addEventListener('keydown',handler);return()=>window.removeEventListener('keydown',handler);},[handleUndo,handleRedo,notes,selectedNoteIds]);React.useEffect(()=>{onUpdateNotes(st.id,notes);},[notes]);const getSnapBeat=(beat,mode)=>{let q=0.25;if(mode==='free')return beat;if(mode==='1')q=4.0;else if(mode==='1/2')q=2.0;else if(mode==='1/4')q=1.0;else if(mode==='1/8')q=0.5;else if(mode==='1/16')q=0.25;else if(mode==='4')q=4.0;else if(mode==='1/32')q=0.125;return Math.round(beat/q)*q;};const getSnapDuration=mode=>{if(mode==='free')return 0.25;if(mode==='1')return 4.0;if(mode==='1/2')return 2.0;if(mode==='1/4')return 1.0;if(mode==='1/8')return 0.5;if(mode==='1/16')return 0.25;if(mode==='4')return 4.0;if(mode==='1/32')return 0.125;return 0.25;};// Local Zoom Wheel Event handler to block browser page zoom
 React.useEffect(()=>{const handleWheelRaw=e=>{if(e.ctrlKey){e.preventDefault();const zoomFactor=e.deltaY<0?1.15:0.85;setRollZoom(prev=>Math.max(15,Math.min(250,prev*zoomFactor)));}};const container=gridScrollRef.current;if(container){container.addEventListener('wheel',handleWheelRaw,{passive:false});}return()=>{if(container){container.removeEventListener('wheel',handleWheelRaw);}};},[]);// Alt + Scroll event listener: fast‑forward playhead + play notes
 React.useEffect(()=>{const handleCanvasWheel=e=>{const canvas=canvasRef.current;if(!canvas)return;const rect=canvas.getBoundingClientRect();const mx=e.clientX-rect.left;const my=e.clientY-rect.top;const pitch=127-Math.floor(my/NoteHeight);if(e.shiftKey){e.preventDefault();// Shift+scroll on note → change velocity