Function fix_enharmonics 

pub fn fix_enharmonics(
    changes: &[Change],
    midi: &Stream,
    omr: &mut Stream,
) -> Result<()>

Respells each note of the reading the performance plays enharmonically to it: music21’s EnharmonicFixer.

Every element the changes name in the reading is coloured black. Of two notes changed into each other no more than a fifth apart, by interval class:

1. a reading’s natural is dropped where the notes sound alike, and where the reading is a semitone off it becomes the flat above or the sharp below the note played;
2. a reading’s sharp or flat on the letter played takes the played note’s accidental;
3. a sharp read a whole tone above the note played becomes a flat, and a flat read a whole tone below a sharp;
4. a note played sharp or flat on the letter read, but read otherwise, takes the played pitch.

Errors

A change with no references, or one naming nothing in its stream.