Hello, In https://gitlab.com/lilypond/lilypond/-/merge_requests/818, I am proposing a change that will affect Scheme engravers. Basically, with that patch, the same grob type can be used to make grobs of any class. For example, FootnoteItem and FootnoteSpanner are unified into Footnote. It is the job of engravers to choose whether to make an Item or a Spanner. ly:engraver-make-grob is thus replaced with ly:engraver-make-item and ly:engraver-make-spanner.
Just a heads-up for Scheme power users so you have a chance to comment. Regards, Jean
