Hi, with e35b7959dfe the note-markup-command was changed to need a duration-argument, before it was a string. With, MR 627 "Revisit rest-markup-commands" https://gitlab.com/lilypond/lilypond/-/merge_requests/627 I attempt to do similar for the rest-markup-command.
This change would need a convert-rule, imho. Alas, this is beyond my capabilities. Any volunteer? Btw, e35b7959dfe contains a convert-rule for the note-markup, though it does not seem to work. Using convert-ly from recent master, running over a file containing: %%%%%%%%%%%%%% \version "2.18.2" \markup \note #"4." #UP %%%%%%%%%%%%%% returns: convert-ly atest-107.ly convert-ly (GNU LilyPond) 2.23.1 convert-ly: Processing `atest-107.ly'... Applying conversion: 2.19.2, 2.19.7, 2.19.11, 2.19.16, 2.19.22, 2.19.24, 2.19.28, 2.19.29, 2.19.32, 2.19.39, 2.19.40, 2.19.46, 2.19.49, 2.20.0, 2.21.0, 2.21.2 \version "2.21.2" \markup \note #"4." #UP cc-ing David Thanks, Harm
