Re: SystemStart changes after stop/startStaff - how to get it back

[Thomas Morley]

Am So., 12. Apr. 2020 um 14:00 Uhr schrieb Aaron Hill
<address@hidden>:
>
> On 2020-04-12 3:50 am, Thomas Morley wrote:
> > Hi,
> >
> > consider the following code:
> >
> >
> > mus = \new Staff { R1 \break R \stopStaff s \startStaff R \break R
> > \break R }
> >
> > \new StaffGroup
> >   \with {
> >       systemStartDelimiterHierarchy =
> >         #'(SystemStartBracket (SystemStartBrace a b c))
> >   }
> >   << \mus \mus \mus >>
> >
> >
> > The SystemStartBrace vanishes after stop/startStaff.
> > I'm at a loss here, it does not work out of the box for every version
> > from 2.12.3 up to master.
> >
> > Any chance to get the additional SystemStartBrace back?
>
> Yes, but it might have side-effects:
>
> %%%%
> systemStartDelimiterHierarchy =
>    #'(SystemStartBracket
>        (SystemStartBrace a b c)
>        (SystemStartBrace a b c))
> %%%%
>
> Since \stopStaff and \startStaff create new StaffSymbols, it appears the
> System_start_delimiter_engraver thinks that these are extra staves in
> parallel, so your hierarchy says to do this:
>
>     ( / =====
>     < | =====
>     ( | =====
>       | =====
>       | =====
>       \ =====
>
> Of course, the StaffSymbols never appear at the same time, because they
> are meant to be replacements.  But the SystemStartBrace only spans the
> first three staves, so it does not apply in the latter part of the
> score.
>
> Knowing that a duplicate set of staves will appear at some point, you
> can lie about the hierarchy as my hack above does.  This allows the
> second set of StaffSymbols to be grouped as desired.
>
> Ultimately, System_start_delimiter_engraver needs to be watching for
> \stopStaff and \startStaff events so it can clean up and rebuild its
> StaffSymbol collection rather than just append to the existing one.
>
>
> -- Aaron Hill

Hi Valentin, Aaron,

many thanks for your insights and hints.
I'll play around with it. Ofcourse my actual usecase is far more
complex than the minimal above...

Any thoughts for
http://lilypond.1069038.n5.nabble.com/Setting-SystemStartBracket-style-to-brace-failing-td231524.html
as well?
This is another showstopper...


Best,
  Harm