// Duration in number of notes, simply to draw in the piano roll.
public int GetSlideNoteDuration(Note note, int patternIdx, int noteIdx)
{
Debug.Assert(note.IsMusical);
FindNextNoteForSlide(patternIdx, noteIdx, 256, out var nextPatternIdx, out var nextNoteIdx); // 256 is kind of arbitrary.
return(Song.CountNotesBetween(patternIdx, noteIdx, nextPatternIdx, nextNoteIdx));
}