Re: Extenders are not printed for lyrics associated with multi-staff contexts

[Alexander Kobel]

Dear all,

an update to my previous bug report.

First, I attach a slightly simplified and enhanced test case, including 
lyrics attached to ChordNames, TabStaff and FiguredBass. The latter does 
not work. I guess that's reasonable, because there is little point to 
have a FiguredBass without a companion Staff; on the other hand, I'm not 
sure if it points to a structural deficiency of the association 
algorithm, because AFAICS the FiguredBass is probably not that different 
from a ChordNames context when it comes to alignment...

Second, w.r.t. ChoirStaves/GrandStaves/StaffGroups, I tried to find my 
way through the codebase and figure out why no extenders are created.
Going over the get_voice_to_lyrics function in lily/lyric-engraver.cc, I 
eventually noticed that correct extenders are printed for lyrics 
assigned to Staff and one of the above contained groups *unless there is 
a ChordNames context.* (That's why the ChordNames lines are commented 
out in the attached file...)

Maybe those settings could be applied per default for lyrics assigned to 
container contexts once someone more knowledgeable than I can resolve 
the issue with ChordNames?


Cheers,
Alexander


On 2016-12-26 16:31, Alexander Kobel wrote:
> Dear all,
>
> since the advent of 2.19.50, it is possible to attach lyrics to
> different contexts than just a voice:  "The \addlyrics function now
> works with arbitrary contexts incuding Staff."
> Indeed, for Staves, it works like a charm AFAICS.  However, when
> attached to a ChoirStaff, GrandStaff or StaffGroup, no extenders are
> generated.  (Nb: the *alignment* with notes / music columns works
> perfectly fine, just the extender generation fails.)
>
> Attached is a test case.  The lyrics lines for the three multi-staff
> contexts should look like the single-staff line, as far as I can tell.
>
>
> Best,
> Alexander

lyr-ctx.ly
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