Lane action in LaneStore for dragging a note over a note or an empy lane instead of attachToLane. Source: http://survivejs.com/webpack_react/implementing_dnd/

move_forof.js

  move({sourceId, targetId}){
    const lanes = [];
    let sourceCheck, targetCheck;

    for(let lane of this.lanes){

      if (sourceCheck && targetCheck) {
        lanes.push(lane);
        continue;
      }

      const notes = [];
      lanes.push({...lane, notes});

      if (lane.id === targetId) {

        if(lane.notes.length) return;

        notes.push(sourceId);
        targetCheck = true;
        continue;
      }

      for(let note of lane.notes){

        switch(note){
          case sourceId:
            sourceCheck = true;
            break;
          case targetId:
            if(sourceCheck){
              notes.push(targetId, sourceId);
            } else {
              notes.push(sourceId, targetId);
            }
            targetCheck = true;
            break;
          default:
            notes.push(note);
            break;
        }
      }
    }

    this.setState({lanes});
  }