fix: targetTrackId undefined outside updateActiveTracks closure

Move track Y-position computation before updateActiveTracks so
targetTrackId is accessible for setDraggedSectionItem update.

app/static/js/app.precompiled.js

@@ -342,8 +342,8 @@ const handleSweepSelectStart=(trackId,startTime,startY)=>{isSweepingRef.current=
 };// ── 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,trackId:t.id};});(t.midiItems||[]).forEach(function(m){if(selArr.indexOf(m.id)>=0)originals[m.id]={type:'midiItem',start:m.startTime,trackId:t.id};});(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,trackId:t.id};});});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 rearrangeNewId='sec_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedSections.push({...sec,id:rearrangeNewId,name:sec.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'section',start:sec.start};}}else if(info.type==='midiItem'){var mid=(t.midiItems||[]).find(function(m){return m.id===oid;});if(mid){var rearrangeNewId='midi_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedMidi.push({...mid,id:rearrangeNewId,name:mid.name+' (Copy)'});newOriginals[rearrangeNewId]={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 rearrangeNewId='clip_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedClips.push({...clip,id:rearrangeNewId,startTime:clip.startTime,name:clip.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'clip',start:clip.startTime};}}});return{...t,sections:updatedSections,midiItems:updatedMidi,clips:updatedClips};});});var newItemId=Object.keys(newOriginals)[0]||itemId;setDraggedSectionItem({trackId,itemType,itemId:newItemId,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 rearrangeNewId=itemType+'_dup_'+Date.now();var newItem={...item,id:rearrangeNewId,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:rearrangeNewId,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);}updateActiveTracks(prev=>{// Compute target track from mouse Y position relative to timeline wrapper
-var trkIds=prev.map(function(tr){return tr.id;});var baseIdx=trkIds.indexOf(drag.trackId);if(baseIdx<0)baseIdx=0;var trackTop=0;var targetIdx=-1;var mouseY=e.clientY-rect.top;for(var ti=0;ti<prev.length;ti++){var tH=prev[ti].height||(prev[ti].isArmed?164:140);if(mouseY>=trackTop&&mouseY<trackTop+tH){targetIdx=ti;break;}trackTop+=tH;}if(targetIdx<0)targetIdx=mouseY<trackTop?0:prev.length-1;if(targetIdx<0)targetIdx=0;var targetTrackId=prev[targetIdx].id;var crossOffset=targetIdx-baseIdx;let movedItem=null;for(let track of prev){const sec=(track.sections||[]).find(it=>it.id===drag.itemId);const mid=(track.midiItems||[]).find(it=>it.id===drag.itemId);if(sec||mid){movedItem=sec||mid;break;}}if(drag.multiIds){var dragOrigStart=drag.multiIds[drag.itemId]?drag.multiIds[drag.itemId].start:0;var delta=newStart-dragOrigStart;// Ensure enough tracks exist for all displaced items
+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);}// Compute target track from mouse Y position
+var allTrks=activeTracksRef.current||[];var mouseY=e.clientY-rect.top;var trackTop=0;var targetIdx=-1;for(var ti=0;ti<allTrks.length;ti++){var tH=allTrks[ti].height||(allTrks[ti].isArmed?164:140);if(mouseY>=trackTop&&mouseY<trackTop+tH){targetIdx=ti;break;}trackTop+=tH;}if(targetIdx<0)targetIdx=mouseY<trackTop?0:Math.max(0,allTrks.length-1);var targetTrackId=allTrks[targetIdx]?allTrks[targetIdx].id:drag.trackId;updateActiveTracks(prev=>{var trkIds=prev.map(function(tr){return tr.id;});var baseIdx=trkIds.indexOf(drag.trackId);if(baseIdx<0)baseIdx=0;var tIdx=trkIds.indexOf(targetTrackId);if(tIdx<0)tIdx=prev.length-1;if(tIdx<0)tIdx=0;var crossOffset=tIdx-baseIdx;let movedItem=null;for(let track of prev){const sec=(track.sections||[]).find(it=>it.id===drag.itemId);const mid=(track.midiItems||[]).find(it=>it.id===drag.itemId);if(sec||mid){movedItem=sec||mid;break;}}if(drag.multiIds){var dragOrigStart=drag.multiIds[drag.itemId]?drag.multiIds[drag.itemId].start:0;var delta=newStart-dragOrigStart;// Ensure enough tracks exist for all displaced items
 var maxTrg=0;Object.keys(drag.multiIds).forEach(function(mid){var inf=drag.multiIds[mid];var origIdx=trkIds.indexOf(inf.trackId);if(origIdx<0)origIdx=baseIdx;var trg=Math.max(0,origIdx+crossOffset);if(trg>maxTrg)maxTrg=trg;});var tracksToAdd=[];while(prev.length<=maxTrg){var newId=(prev.length+tracksToAdd.length+1).toString();var colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309'];tracksToAdd.push({id:newId,name:'Track '+newId,buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:colors[(prev.length+tracksToAdd.length)%colors.length],clips:[],midiItems:[],sections:[],markers:[],isArmed:false,height:140});}if(tracksToAdd.length>0)prev=prev.concat(tracksToAdd);return prev.map(function(t){var resS=(t.sections||[]).slice();var resM=(t.midiItems||[]).slice();var resC=(t.clips||[]).slice();Object.keys(drag.multiIds).forEach(function(mid){var inf=drag.multiIds[mid];var newVal=inf.start+delta;// Use ORIGINAL trackId stored at drag start for track offset math
 var origTid=inf.trackId;var origIdx=trkIds.indexOf(origTid);if(origIdx<0)origIdx=baseIdx;var itemTrgIdx=Math.max(0,origIdx+crossOffset);var itemTid=itemTrgIdx<prev.length?prev[itemTrgIdx].id:null;if(!itemTid)return;// Remove from source if leaving for another track
 var isOnThisTrack=false;if(inf.type==='section')isOnThisTrack=(t.sections||[]).some(function(s){return s.id===mid;});else if(inf.type==='midiItem')isOnThisTrack=(t.midiItems||[]).some(function(mx){return mx.id===mid;});else if(inf.type==='clip')isOnThisTrack=(t.clips||[]).some(function(cx){return cx.id===mid||'default_'+t.id===mid;});if(isOnThisTrack&&t.id!==itemTid){if(inf.type==='section')resS=resS.filter(function(s){return s.id!==mid;});else if(inf.type==='midiItem')resM=resM.filter(function(mx){return mx.id!==mid;});else if(inf.type==='clip'){var c3='default_'+t.id;resC=resC.filter(function(cx){return cx.id!==mid&&cx.id!==c3;});}}if(t.id===itemTid){var srcItem=null;for(var pi2=0;pi2<prev.length;pi2++){var tr2=prev[pi2];if(inf.type==='section')srcItem=(tr2.sections||[]).find(function(s){return s.id===mid;});else if(inf.type==='midiItem')srcItem=(tr2.midiItems||[]).find(function(mx){return mx.id===mid;});else if(inf.type==='clip'){var c2=(tr2.clips||[]).find(function(cx){return cx.id===mid||'default_'+tr2.id===mid;});if(c2)srcItem=c2;}if(srcItem)break;}if(srcItem){if(inf.type==='section'){resS=resS.filter(function(s){return s.id!==mid;});resS.push({...srcItem,start:Math.max(0,newVal)});}else if(inf.type==='midiItem'){resM=resM.filter(function(mx){return mx.id!==mid;});resM.push({...srcItem,startTime:Math.max(0,newVal)});}else if(inf.type==='clip'){var c4='default_'+t.id;resC=resC.filter(function(cx){return cx.id!==mid&&cx.id!==c4;});resC.push({...srcItem,startTime:Math.max(0,newVal)});}}}});return{...t,sections:resS,midiItems:resM,clips:resC};});}return prev.map(function(tr){var its=drag.itemType==='section'?(tr.sections||[]).filter(function(it){return it.id!==drag.itemId;}):(tr.midiItems||[]).filter(function(it){return it.id!==drag.itemId;});if(tr.id===targetTrackId&&movedItem){its.push(drag.itemType==='section'?{...movedItem,start:newStart}:{...movedItem,startTime:newStart});}return drag.itemType==='section'?{...tr,sections:its}:{...tr,midiItems:its};});});if(drag.trackId!==targetTrackId){setDraggedSectionItem(function(p){return{...p,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 ──