Re: acciaccatura as first element of alternative

[Jean Abou Samra]

Le 21/03/2021 à 22:14, Roeland Visscher a écrit :

The appended .ly file, using a acciaccatura as first element of an alternative, generates the warning message (in French) “Avertissement : extension de reprise déjà présente, fin prématurée de celle-ci”

and a weird representation of the alternatives in the generated score.

Behaviour is normal if there is only one staff, or if both staffs have an acciaccatura at start of the alternative.

Anything wrong with my script?

Software bug?

Workaround?

 

Thanks for your help…

 

Roeland

Hello,

For your information, we also have a helpful and active French-speaking user group, lilypond-user-fr; see lilypond.org/contact.fr.html ("Liste de diffusion francophone" at the bottom).

This is a very famous bug that is documented:

http://lilypond.org/doc/v2.22/Documentation/notation/special-rhythmic-concerns#grace-notes

That page has an example resembling the one you posted. The workaround is to use a spacer rest as grace in the other voice. On your file, this results in:

\version "2.23.1"

\header {
  title = "Acciaccature"
}

<<
  \new Staff {
    \relative c' {
      \clef treble
      \key es \major
      \time 11/8
      \repeat volta 2 {
        c8([ d)] es4 es8( f4) es8([ d] es4)
      }
      \alternative {
        {
          \acciaccatura g8
          as4   as4 g( f8) \acciaccatura as8  bes2
        }
        {
          \acciaccatura g8
          as4 as g( f8) \acciaccatura as8  bes2
        }
      }
    }
  }
  \new Staff {
    \relative c' {
      \clef treble
      \key es \major
      \time 11/8
      \repeat volta 2 {
        c4 c c4. c2
      }
      \alternative {
        {
          c4 es d4. d2
        }
        {
          \grace s8
          c4 es d4. es2
        }
      }
    }
  }
>>

Best regards,
Jean