repeat volta and \barNumberCheck

[Jean Abou Samra]

> Hi.  I'm hoping to get some input from this wonderful group.
>
> It seems that repeat volta and \barNumberCheck don't work well
> together when you use the \alternative function.  If you put a
> \barNumberCheck inside of a repeat volta, the \braNumberCheck fails
> all the time.  I think it's because when you go through the music a
> second time, the numbering is off.
>
> This may not be a bug, but it's pretty inconvenient. Here's my MWE:
>       
      
      
> %%% Start
> \version "2.20.0"
>
> rightHand = \relative c' {
>   \repeat volta 2 {
>     \partial 4 f4
>     \barNumberCheck 2
>     c4 d e
>   }
>
>   \repeat volta 2 {
>     f4 |
>     \barNumberCheck 3
>     c4 d e f |
>   }
> }
>
> \include "articulate.ly"
>
> \score {
>   \articulate {
>     \new Staff \rightHand
>   }
> }
> %%%End
>
>

Hello,

I believe the problem is not related to \repeat volta. The output with articulate.ly
is definitely wrong (it inserts rests, not sure why; I can't comment here since I never
used this script). You still get warnings when removing its use, and that of \repeat:

\version "2.21.7"
\new Voice \relative c' {
    \partial 4 f4
    \barNumberCheck 2
    c4 d e
    f4 |
    \barNumberCheck 3
    c4 d e f |
}

This comes from a misexpectation: from LilyPond's point of view, a partial does not count
as a measure. If you try:

\layout {
  \context {
    \Score
    \override BarNumber.break-visibility = #all-visible
  }
}

you will see that measure 1 is the first whole measure.

That's the behavior I'd expect as a musician. You can still override it if you so like,
by starting the music with

    \set Score.currentBarNumber = 2   

Best,
Jean Abou-Samra