Re: Error message using AikenHeads with NullVoice

[Jean Abou Samra]

On 7/7/22 18:23, David F. wrote:
> > On Jul 7, 2022, at 1:59 AM, Valentin Petzel <valentin@petzel.at> wrote:
> >
> > A different way to approach the problem would be to also specify something like
> >
> > \context {
> >       \NullVoice
> >       shapeNoteStyles = ##()
> > }
> >
> > It is still questionable why NullVoice would hickup on simply changing the
> > NoteHead style, so think this is worth creating a bug report.
> >
> > Cheers,
> > Valentin
> Yes, it does seem odd—and avoidable—that NullVoice would have a problem with 
> shape notes.
>
> With aikenHeads, there is one note-head shape (the triangle that is not a 
> pyramid) that depends on the stem direction.  My assumption is that’s where the 
> error is coming from.

Yup.

> But if the note is not being shown at all, that logic doesn’t need to be 
> executed.

The definition of NullVoice in ly/engraver-init.ly contains

  %% provide non-printing NoteHeads with proper extents for lyric alignment
  \consists Note_heads_engraver
  \omit NoteHead
  \override NoteHead.X-extent = #(lambda (g)
    (ly:stencil-extent (ly:note-head::print g) X))


Best,
Jean