Use correct dataset index in parseVisibleItems (#6786)
Use correct dataset index in parseVisibleItems (#6786)

* Use correct dataset index

* Review1

chartjs/Chart.js,touletan/Chart.js,nnnick/Chart.js,touletan/Chart.js,chartjs/Chart.js,touletan/Chart.js,chartjs/Chart.js,chartjs/Chart.js,touletan/Chart.js