[Lilypond-auto] Issue 2632 in lilypond: Allow multiple occurences of Footnote_engraver

[lilypond]

Status: Accepted
Owner: ----

New issue 2632 by address@hidden: Allow multiple occurences of  
Footnote_engraver
http://code.google.com/p/lilypond/issues/detail?id=2632

Issue 1773 moves the Footnote_engraver to Score level since otherwise it is  
not possible to annotate objects outside of Staff level.  However, this  
means that time-based footnotes on multi-staff music will, for example,  
annotate _all_ time signatures/clefs/whatever at a given time step instead  
of just the signature in the current staff.

That is not very useful either.  So the right way to proceed would seem to  
have the Footnote_engraver at multiple levels (like Staff and Score) and  
have the footnote just register on the innermost context encountering it.

This involves both making sure that the footnote mark is placed only once  
per level, as well as making sure that the footnote text is emitted only  
once and automatic numbering advances only by one position.