Re: MetronomeMark and break-visibility

[Thomas Morley]

Am Di., 1. Nov. 2022 um 16:30 Uhr schrieb Jean Abou Samra <jean@abou-samra.fr>:
>
> Le 01/11/2022 à 12:55, Thomas Morley a écrit :
> > Hi,
> >
> > the following code for _Rehearsal_Mark works as expected, i.e. the
> > RehearsalMark is printed at end of line:
> >
> > {
> >    b1
> >    \override Score.RehearsalMark.break-visibility = ##(#t #f #f)
> >    \mark \default
> >    \break
> >    b
> > }
> >
> > Alas, the same for _Metronome_Mark fails, the MetronomeMark is not
> > printed at all:
> >
> > {
> >    b1
> >    \override Score.MetronomeMark.break-visibility = ##(#t #f #f)
> >    \tempo "Andante" 4 = 60
> >    \break
> >    b
> > }
> >
> > although MetronomeMark has settings for break-visibility.
> >
> > Is this on purpose or a bug?
> > How to make it work?
>
>
> This looks weird. In this case at least, Metronome_engraver sets
> non-musical = #t on the MetronomeMark, yet it also sets its X
> parent to the current *musical* column, not the non-musical one.
> That's contradictory. As a result, MetronomeMark is not a breakable
> item, since its parent is PaperColumn and not NonMusicalPaperColumn.
> But it has a break-visibility. This makes for a mess.
>
> It works if you do
>
> \version "2.23.80"
>
> \new Score \with {
>    \consists
>      #(lambda (context)
>         (let ((tempo #f))
>           (make-engraver
>            (acknowledgers
>             ((metronome-mark-interface engraver grob source-engraver)
>              (set! tempo grob)))
>            ((stop-translation-timestep engraver)
>             (when tempo
>               (ly:grob-set-parent! tempo X (ly:context-property context
> 'currentCommandColumn)))
>             (set! tempo #f)))))
> }
> {
>    b1
>    \override Score.MetronomeMark.break-visibility = ##(#t #f #f)
>    \override Score.MetronomeMark.self-alignment-X = #RIGHT
>    \tempo "Andante" 4 = 60
>    \break
>    b
> }
>
>
>
> I suggest to open an issue.
>
> It is probably related to
> https://gitlab.com/lilypond/lilypond/-/issues/1276
>
> Best,
> Jean
>

Done.
https://gitlab.com/lilypond/lilypond/-/issues/6452

Thanks,
  Harm