Re: Key change with clef after the bar line?

[Jean Abou Samra]

Le 01/03/2022 à 23:51, Alasdair a écrit :
> Dear Jean,
>
> I have just had time to make that change (of key to key-signature).  
> However, there is still an issue.  For example, in change from g major 
> to g minor, we go from one sharp to two flats.  As I have a key 
> signature in the middle of a bar (after a “Fine”), my current bar 
> looks like this:
>
> g4^\markup \fontsize #2 \italic "Fin" \bar "||" \set Staff.forceClef = 
> ##t  \key g \minor d8 |
>
> However, what happens is that the natural sign is printed on top of 
> the double bar line.  So either I need to not print the natural (which 
> would be my preference), or somehow push the entire new key signature 
> (one natural and two flats) after the clef sign.
>
> Note that I’m not interested in modern best practice, but I want to 
> (with modern music printing) maintain the spirit of the 18^th century 
> manuscript.


The naturals are printed by a KeyCancellation grob, which has
break-align-symbol 'key-cancellation
(https://lilypond.org/doc/v2.23/Documentation/internals/keycancellation).
When overriding the order, you have not told LilyPond where to
put it. Just add key-cancellation to the vector before
key-signature.

\version "2.22.1"

\language english

global = {
  \clef treble
  \time 4/4
  \override Score.BreakAlignment.break-align-orders =
  #(make-vector 3 '(span-bar
                    breathing-sign
                    staff-bar
                    clef
                    key-cancellation
                    key-signature
                    time-signature))
}

\relative c' {
  \global
  \key g \major
  c4 d e fs |
  g a
  \bar "||"
  \set Staff.forceClef = ##t
  \key c \minor
  bf c |
  bf af g f |
  ef d c2
}


Best,
Jean