Re: \incipit sometimes returns programming error

[Jean Abou Samra]

Le 26/05/2022 à 17:12, Thomas Morley a écrit :
> Hi,
>
> consider:
>
> \score {
>    \new Staff \with { instrumentName = "" }  { \incipit { c'1. } R1 }
>    \layout {
>      indent = 5\cm
>      incipit-width = 3\cm
>    }
> }
>
> with recent versions it returns:
> programming error: Loose column does not have right side to attach to.
>
> First bad comit is:
> commit 8ae26d8330c603d249fec5953a887de9fbcbe31c
> Author: Dan Eble <nine.fierce.ballads@gmail.com>
> Date:   Thu Mar 10 20:08:31 2022 -0500
>
>      Refactor BarLine engraving
>      [...]
>
> Dan?
>
>
> The example above can be fixed by inserting an explicit \bar "" at end
> of incipit-music.
>
>
> Cheers,
>    Harm


That looks like an old bug uncovered to me. \incipit
uses a MensuralStaff, and indeed I can reproduce it
with

\version "2.23.10"

\new MensuralStaff {
  c'1.
}


The definition of MensuralStaff contains measureBarType = "",
and this also triggers the bug:

\version "2.23.10"

\new Staff \with {
  measureBarType = ""
} {
  c'1.
}

which is an instance of our old

https://gitlab.com/lilypond/lilypond/-/issues/4084

I can't tell why the commit "Refactor BarLine engraving" had that
effect (and I'm not investigating). Dan, any thoughts? Should
MensuralStaff simply be changed to have measureBarType = ##f
(instead of "")?

Jean