The legend is never cleared and everytime it gets overwritten by the new data.
Furthermore the overwritten data remember some old computation (like automatic
position/width).
Original issue reported on code.google.com by stefano....@gmail.com on 6 Feb 2014 at 8:26
Original issue reported on code.google.com by
stefano....@gmail.com
on 6 Feb 2014 at 8:26