Re: how to move a clef horizontally

[Jean Abou Samra]

> Folks,
>
> > How about: [... very elegant solution ...]
> >         
>         While Harm's solution is great, I'm under the impression
>           that it shouldn't be needed, i.e., that LilyPond's
>           behaviour classifies as a bug. I tried to boil the
>           example down to its essentials:
>         
> \version "2.20.0"
>
> \new PianoStaff
> <<
>   \new Staff = "upper" {
>     e''4 \clef bass f
>   }
>   \new Staff = "lower" {
>     \clef bass
>     c16 e' \change Staff = "upper" g' c''
>     \change Staff = "lower"
>     d,4
>   }
> >>
>
> Also, compare:
>
> \version "2.20.0"
>
> \new PianoStaff
> <<
>   \new Staff = "upper" {
>     \clef bass
>     e4*3/4 \clef violin s4*1/4 f
>   }
>   \new Staff = "lower" {
>     \clef bass
>     c16 e \change Staff = "upper" g c''
>     \change Staff = "lower"
>     d,4
>   }
> >>
>
> What do you think?
>
> Lukas
>

It clearly qualifies as a bug to me. It seems to happen whenever a \change Staff occurs at the same musical moment as a clef or key change.

\version "2.21.80"

<<
  \new Staff <<
    {
      c''4
      \clef treble
      4
    }
    \\
    {
      g'8 8
      \change Staff = "lower"
    }
  >>
  \new Staff = "lower" { s2 }
>>

Note that if you comment out the note just after the clef, i.e.

\version "2.21.80"

<<
  \new Staff <<
    {
      c''4
      \clef treble
    }
    \\
    {
      g'8 8
      \change Staff = "lower"
    }
  >>
  \new Staff = "lower" { s2 }
>>

the output gets particularly bad. Yet, I think that is another bug, probably reminiscent of https://gitlab.com/lilypond/lilypond/-/issues/4084, because it disappears if the \clef is no longer played during another note:

\version "2.21.80"

<<
  \new Staff <<
    {
      c''4
      \clef treble
    }
    \\
    {
      g'8 8
      \change Staff = "lower"
    }
  >>
  \new Staff = "lower" { s4 4 }
>>

Best,
Jean