Provide a better "let ring", or an open ended slur/tie
In #298080: [Musicxml Export] - Let Ring Not Exported, hhpmusic requested to have the Let it ring or Laissez Vibrer to have musicxml export capability. I haven't tested this to ensure it works correctly yet, but the symbol lacks an accurate visual representation we expect when we see a L.V. at the end of a note. There needs to be a way to add the L.V. that looks like a tie where no grace note after or invisible real note is required to make it look right and the can be true L.V. exported to musicxml.
After discussing this with hhpmusic, he reminded me that the symbol is only applied to an entire chord and the tie needs to be attached to each note of a chord.