Fretboard diagrams: allow multiple barrés
Currently, only only one barré or partial barré is allowed per diagram. In practice guitarists (etc.) can use 2 or even 3 partial barrés. e.g.
And sometimes 2 are needed on one position:
Suggestion: Allow up to 3 (partial) barrés per diagram, with up to 2 partial barrés per position. And allow partial barrés to be created even if they do not end on the 1st string (see #275658: The ability to draw partial barre is missing for fretboard diagrams).
Related to #283681: [EPIC] Fretboard diagram issues.