Is it because NullVoice is has now been moved in terms of its context
'position' (if that is the right word)?
http://git.savannah.gnu.org/gitweb/?p=lilypond.git;a=commit;h=fc8c2d680464130af497c386ed5f0033d3fd7470
Yes. But we can revert that.
The commit just before that one fixed the bugs in NullVoice; then the commit
you found moved NullVoice to Score so I wouldn't need the part of the bug-fix
with ugly code. I was thinking there might be more unwanted interactions
between NullVoice and the Staff waiting to be found.
Though, I'm not sure it's a bug. I doubt it make much sense to add an
engraver like the solfege-engraver to NullVoice.
I've the feeling it negates the sense of NullVoice.
The description is a place to put notes so you can attach lyrics, without
printing the notes,
<http://www.lilypond.org/doc/v2.19/Documentation/notation/techniques-specific-to-lyrics#polyphony-with-shared-lyrics>
The bug-report in this thread was about an unforeseen use that stopped working:
in addition to Lyrics, use NullVoice to attach numbers giving the pitches.
Easier to add a bug than not
<https://code.google.com/p/lilypond/issues/detail?id=4093>
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