Shuffle Notes

EDIT3: integrated changes from New Retrograde plugin
EDIT2: Fixed a bug: abnormal behavior if last note of score was selected.
EDIT: chord symbols now move in sync with their respective note/chord.
Tip: Select only 1 staff at a time: notes/chords shuffled between staves don’t look good.

This plugin, a variant of the New Retrograde plugin, shuffles notes in a selection but leaves rhythms unchanged. If you ‘shuffle’ a lead sheet one measure at a time the result sounds a bit like a Benny Wallace improv, as in the attached Charlie Parker tune. Could be useful for aspiring improvisers.