fix: multi-item MOVE also discarded cross-track updates

Same bug as copy: return statement only updated
targetTrackId/drag.trackId, discarding items from other tracks.
Fix: always return { sections: midSections, midiItems: midMidis }
for ALL tracks in the map (arrays are sliced per-track).

app/static/js/app.precompiled.js

@@ -334,7 +334,7 @@ const handleAddToSelection=itemId=>{setSelectedItemIds(prev=>{var next=new Set(p
 const handleSweepSelectStart=(trackId,startTime)=>{isSweepingRef.current=true;sweepStartRef.current=startTime;sweepTrackIdRef.current=trackId;var init={startTime,endTime:startTime};sweepSelectRef.current=init;setSweepSelect(init);setSelectedItemIds(new Set());};// ── Section / MIDI Item Drag Start ──
 const handleSectionItemDragStart=(trackId,itemType,itemId,clickOffset,isDuplicate,pendingSelectedIds)=>{var curTracks=activeTracksRef.current||activeTracks;var multiIds=null;var selIds=pendingSelectedIds||selectedItemIds;if(selIds&&selIds.size>0&&selIds.has(itemId)){var selArr=Array.from(selIds);var originals={};curTracks.forEach(function(t){(t.sections||[]).forEach(function(s){if(selArr.indexOf(s.id)>=0)originals[s.id]={type:'section',start:s.start};});(t.midiItems||[]).forEach(function(m){if(selArr.indexOf(m.id)>=0)originals[m.id]={type:'midiItem',start:m.startTime};});(t.clips||[]).forEach(function(c){var cid=c.id==='default'?'default_'+t.id:c.id;if(selArr.indexOf(cid)>=0)originals[cid]={type:'clip',start:c.startTime};});});if(Object.keys(originals).length>0)multiIds=originals;}if(isDuplicate){var track=curTracks.find(function(t){return t.id===trackId;});if(!track)return;if(multiIds){var newOriginals={};updateActiveTracks(function(prev){return prev.map(function(t){var updatedSections=t.sections?t.sections.slice():[];var updatedMidi=t.midiItems?t.midiItems.slice():[];var updatedClips=t.clips?t.clips.slice():[];Object.keys(multiIds).forEach(function(oid){var info=multiIds[oid];if(info.type==='section'){var sec=(t.sections||[]).find(function(s){return s.id===oid;});if(sec){var newId='sec_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedSections.push({...sec,id:newId,name:sec.name+' (Copy)'});newOriginals[newId]={type:'section',start:sec.start};}}else if(info.type==='midiItem'){var mid=(t.midiItems||[]).find(function(m){return m.id===oid;});if(mid){var newId='midi_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedMidi.push({...mid,id:newId,name:mid.name+' (Copy)'});newOriginals[newId]={type:'midiItem',start:mid.startTime};}}else if(info.type==='clip'){var clip=(t.clips||[]).find(function(c){return c.id===oid||'default_'+t.id===oid;});if(clip){var newId='clip_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedClips.push({...clip,id:newId,startTime:clip.startTime,name:clip.name+' (Copy)'});newOriginals[newId]={type:'clip',start:clip.startTime};}}});return{...t,sections:updatedSections,midiItems:updatedMidi,clips:updatedClips};});});setDraggedSectionItem({trackId,itemType,itemId,clickOffset,multiIds:newOriginals});}else{var items=itemType==='section'?track.sections||[]:track.midiItems||[];var item=items.find(function(it){return it.id===itemId;});if(!item)return;var newId=itemType+'_dup_'+Date.now();var newItem={...item,id:newId,name:item.name+' (Copy)'};updateActiveTracks(function(prev){return prev.map(function(t){if(t.id!==trackId)return t;var updated=itemType==='section'?[...(t.sections||[]),newItem]:[...(t.midiItems||[]),newItem];return itemType==='section'?{...t,sections:updated}:{...t,midiItems:updated};});});setDraggedSectionItem({trackId,itemType,itemId:newId,clickOffset,isDuplicate:false});}return;}setDraggedSectionItem({trackId,itemType,itemId,clickOffset,multiIds});};handleSectionItemDragStartRef.current=handleSectionItemDragStart;// ── Section / MIDI Item Resize Start ──
 const handleSectionItemResizeStart=(trackId,itemType,itemId,side,clickTime)=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const items=itemType==='section'?track.sections:track.midiItems;const item=(items||[]).find(it=>it.id===itemId);if(!item)return;const start=itemType==='section'?item.start:item.startTime;setResizedSectionItem({trackId,itemType,itemId,side,originalStart:start,originalDuration:item.duration});};// ── Document-level mousemove/mouseup for Section/MIDI item drag ──
-useEffect(()=>{const handleMouseMove=e=>{const drag=draggedSectionItemRef.current;if(!drag)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);const beatSec=60.0/(parseInt(bpm)||120);const secondsPerBar=beatSec*4;const marginBar=maxDurationRef.current-secondsPerBar;const rawStart=Math.max(0,Math.min(time-drag.clickOffset,marginBar));const newStart=snapTime(rawStart,snapValueRef.current,bpmRef.current);const itemPx=newStart*zoom;const keepMargin=80;if(itemPx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=itemPx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(itemPx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,itemPx-keepMargin);setCanvasRedrawCount(n=>n+1);}const targetTrackId=hoveredTrackIdRef.current||drag.trackId;updateActiveTracks(prev=>{let movedItem=null;for(let track of prev){const items=drag.itemType==='section'?track.sections||[]:track.midiItems||[];const found=items.find(it=>it.id===drag.itemId);if(found){movedItem=found;break;}}return prev.map(t=>{if(drag.multiIds){var dragOrigStart=drag.multiIds[drag.itemId]?drag.multiIds[drag.itemId].start:0;var delta=newStart-dragOrigStart;var midSections=(t.sections||[]).slice();var midMidis=(t.midiItems||[]).slice();Object.keys(drag.multiIds).forEach(function(mid){var info=drag.multiIds[mid];var newVal=info.start+delta;if(info.type==='section'){var idx=midSections.findIndex(function(s){return s.id===mid;});if(idx>=0)midSections[idx]={...midSections[idx],start:Math.max(0,newVal)};}else if(info.type==='midiItem'){var idx=midMidis.findIndex(function(m){return m.id===mid;});if(idx>=0)midMidis[idx]={...midMidis[idx],startTime:Math.max(0,newVal)};}});return t.id===targetTrackId?{...t,sections:midSections,midiItems:midMidis}:{...t,sections:t.id===drag.trackId?midSections:t.sections,midiItems:t.id===drag.trackId?midMidis:t.midiItems};}const items=drag.itemType==='section'?t.sections||[]:t.midiItems||[];const updatedItems=items.filter(it=>it.id!==drag.itemId);if(t.id===targetTrackId){if(movedItem){updatedItems.push(drag.itemType==='section'?{...movedItem,start:newStart}:{...movedItem,startTime:newStart});}else{if(drag.itemType==='section'){updatedItems.push({id:drag.itemId,name:'Section',start:newStart,duration:4*secondsPerBar,color:'#06b6d4'});}else{updatedItems.push({id:drag.itemId,name:'MIDI Item',startTime:newStart,duration:4*secondsPerBar,notes:[],color:'#a78bfa'});}}}return drag.itemType==='section'?{...t,sections:updatedItems}:{...t,midiItems:updatedItems};});});if(drag.trackId!==targetTrackId){setDraggedSectionItem(prev=>({...prev,trackId:targetTrackId}));}};const handleMouseUp=()=>{const drag=draggedSectionItemRef.current;if(!drag)return;setDraggedSectionItem(null);showToast(`Đã di chuyển ${drag.itemType==='section'?'section':'MIDI item'}.`,'success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Pending drag: Ctrl+click toggles selection; mousemove > threshold starts copy-drag ──
+useEffect(()=>{const handleMouseMove=e=>{const drag=draggedSectionItemRef.current;if(!drag)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);const beatSec=60.0/(parseInt(bpm)||120);const secondsPerBar=beatSec*4;const marginBar=maxDurationRef.current-secondsPerBar;const rawStart=Math.max(0,Math.min(time-drag.clickOffset,marginBar));const newStart=snapTime(rawStart,snapValueRef.current,bpmRef.current);const itemPx=newStart*zoom;const keepMargin=80;if(itemPx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=itemPx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(itemPx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,itemPx-keepMargin);setCanvasRedrawCount(n=>n+1);}const targetTrackId=hoveredTrackIdRef.current||drag.trackId;updateActiveTracks(prev=>{let movedItem=null;for(let track of prev){const items=drag.itemType==='section'?track.sections||[]:track.midiItems||[];const found=items.find(it=>it.id===drag.itemId);if(found){movedItem=found;break;}}return prev.map(t=>{if(drag.multiIds){var dragOrigStart=drag.multiIds[drag.itemId]?drag.multiIds[drag.itemId].start:0;var delta=newStart-dragOrigStart;var midSections=(t.sections||[]).slice();var midMidis=(t.midiItems||[]).slice();Object.keys(drag.multiIds).forEach(function(mid){var info=drag.multiIds[mid];var newVal=info.start+delta;if(info.type==='section'){var idx=midSections.findIndex(function(s){return s.id===mid;});if(idx>=0)midSections[idx]={...midSections[idx],start:Math.max(0,newVal)};}else if(info.type==='midiItem'){var idx=midMidis.findIndex(function(m){return m.id===mid;});if(idx>=0)midMidis[idx]={...midMidis[idx],startTime:Math.max(0,newVal)};}});return{...t,sections:midSections,midiItems:midMidis};}const items=drag.itemType==='section'?t.sections||[]:t.midiItems||[];const updatedItems=items.filter(it=>it.id!==drag.itemId);if(t.id===targetTrackId){if(movedItem){updatedItems.push(drag.itemType==='section'?{...movedItem,start:newStart}:{...movedItem,startTime:newStart});}else{if(drag.itemType==='section'){updatedItems.push({id:drag.itemId,name:'Section',start:newStart,duration:4*secondsPerBar,color:'#06b6d4'});}else{updatedItems.push({id:drag.itemId,name:'MIDI Item',startTime:newStart,duration:4*secondsPerBar,notes:[],color:'#a78bfa'});}}}return drag.itemType==='section'?{...t,sections:updatedItems}:{...t,midiItems:updatedItems};});});if(drag.trackId!==targetTrackId){setDraggedSectionItem(prev=>({...prev,trackId:targetTrackId}));}};const handleMouseUp=()=>{const drag=draggedSectionItemRef.current;if(!drag)return;setDraggedSectionItem(null);showToast(`Đã di chuyển ${drag.itemType==='section'?'section':'MIDI item'}.`,'success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Pending drag: Ctrl+click toggles selection; mousemove > threshold starts copy-drag ──
 useEffect(()=>{const handleMouseMove=e=>{var pd=pendingDragRef.current;if(!pd)return;var dx=e.clientX-pd.startX;if(Math.abs(dx)>5){var pdSnap=pendingDragRef.current;pendingDragRef.current=null;if(handleSectionItemDragStartRef.current)handleSectionItemDragStartRef.current(pdSnap.trackId,pdSnap.itemType,pdSnap.itemId,pdSnap.clickOffset,true,pdSnap.selectedIds);}};document.addEventListener('mousemove',handleMouseMove);var handleMouseUp=function(){pendingDragRef.current=null;};document.addEventListener('mouseup',handleMouseUp);return function(){document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);pendingDragRef.current=null;};},[]);// ── Document-level mousemove/mouseup for Section/MIDI item resize ──
 useEffect(()=>{const handleMouseMove=e=>{const resize=resizedSectionItemRef.current;if(!resize)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);updateActiveTracks(prev=>prev.map(t=>{if(t.id!==resize.trackId)return t;const items=resize.itemType==='section'?[...(t.sections||[])]:[...(t.midiItems||[])];const idx=items.findIndex(it=>it.id===resize.itemId);if(idx===-1)return t;const item=items[idx];if(resize.side==='left'){const beatSec=60.0/(parseInt(bpm)||120);const newStart=Math.max(0,Math.min(time,resize.originalStart+resize.originalDuration-0.1));const end=resize.originalStart+resize.originalDuration;const newDuration=end-newStart;if(newDuration<0.1)return t;items[idx]=resize.itemType==='section'?{...item,start:newStart,duration:newDuration}:{...item,startTime:newStart,duration:newDuration};}else{const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const marginBar=maxDurationRef.current-secondsPerBar;const clampedTime=Math.min(time,marginBar);const snappedDuration=snapValueRef.current!=='free'?snapTime(clampedTime-resize.originalStart,snapValueRef.current,bpm):clampedTime-resize.originalStart;const newDuration=Math.max(0.1,snappedDuration);items[idx]={...item,duration:newDuration};}return resize.itemType==='section'?{...t,sections:items}:{...t,midiItems:items};}));setCanvasRedrawCount(n=>n+1);const edgePx=(resize.side==='left'?Math.max(0,time):time)*zoom;const keepMargin=80;if(edgePx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=edgePx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(edgePx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,edgePx-keepMargin);setCanvasRedrawCount(n=>n+1);}};const handleMouseUp=()=>{const resize=resizedSectionItemRef.current;if(!resize)return;setResizedSectionItem(null);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Sweep Select mousemove/mouseup ──
 useEffect(()=>{const handleMouseMove=e=>{if(!isSweepingRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);setSweepSelect(prev=>{var updated=prev?{...prev,endTime:time}:null;sweepSelectRef.current=updated;return updated;});};const handleMouseUp=()=>{if(!isSweepingRef.current)return;isSweepingRef.current=false;sweepTrackIdRef.current=null;const sweep=sweepSelectRef.current;sweepSelectRef.current=null;if(sweep){const start=Math.min(sweep.startTime,sweep.endTime);const end=Math.max(sweep.startTime,sweep.endTime);const curTracks=activeTracksRef.current||[];const found=new Set();curTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.startTime<end&&m.startTime+m.duration>start){found.add(m.id);}});(t.sections||[]).forEach(s=>{if(s.start<end&&s.start+s.duration>start){found.add(s.id);}});(t.clips||[]).forEach(c=>{const dur=c.buffer?c.buffer.duration/(c.speed||1.0):4;if(c.startTime<end&&c.startTime+dur>start){const cid=c.id==='default'?'default_'+t.id:c.id;found.add(cid);}});});setSelectedItemIds(found);setSweepSelect(null);sweepTrackIdRef.current=null;}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);const handleSelectRange=(start,end,reset)=>{const maxLen=maxDuration;const cleanStart=Math.max(0,Math.min(maxLen,start));const cleanEnd=Math.max(0,Math.min(maxLen,end));if(reset){setSelectionStart(cleanStart);setSelectionEnd(cleanEnd);}else{setSelectionEnd(cleanEnd);}// LOOP_EDITOR_2.md §4.2: new selection = enable looping