Re: Padding paper setting not honored

[Knute Snortum]

On Tue, Aug 30, 2022 at 4:45 PM Jean Abou Samra <jean@abou-samra.fr> wrote:
>
> Le 31/08/2022 à 01:33, Knute Snortum a écrit :
> > Hi everyone,
> >
> > I have a problem that is unfortunately very difficult to reproduce.
> > It seems in some circumstances that the padding setting in the paper
> > block is not honored.  I've attached a screenshot.  In the middle you
> > can see that the slur from the bottom stave is going through the pedal
> > marking of the top stave.  It looks like the padding is measured from
> > the ottava bracket and not the slur, but that's just a guess.
> >
> > I have tried and failed to create a MWE.  I've attached my attempt but
> > unfortunately it does not reproduce the problem. (I couldn't get the
> > ottava bracket below the slur which may be why the MWE fails.)
> >
> > For the brave, I have uploaded my source files to GitHub:
> > https://github.com/ksnortum/chopin-opus-25/tree/main
> >
> > If anyone is willing to tackle this problem, it would be much appreciated.
>
>
>
> Well, here is a reasonably minimal example:
>
> \version "2.23.12"
>
> veryHigh =
>    \shape #'((0 . 0) (0 . 10) (0 . 10) (0 . 0)) \etc
>
> <<
>    \new Staff {
>      R1
>      \break
>      % OK
>      c'''2\veryHigh ( 2)
>      \break
>      % KO
>      c'''2\veryHigh ( \change Staff = down 2)
>    }
>    \new Staff = down {
>      s1*3
>    }
>  >>
>
>
> Unfortunately, this is hard to fix. The second is cross-staff. Because of
> this, its shape, and consequently its height, depend on the exact distance
> between the staves (inside one system). But that distance depends itself
> on everything else that is on the page (other systems), as LilyPond will
> try to find a good fit for the page globally. So LilyPond needs to space
> the staves before it can know how tall the slur it is.
>
> (*Maybe* it would be possible to let LilyPond reuse the pure height
> estimation
> in this case. I'm not sure, and I haven't tried.)
>
> For now, I am afraid you need to resort to manual system positioning,
> as described on
>
> https://lilypond.org/doc/v2.22/Documentation/notation/explicit-staff-and-system-positioning
>
> Best,
> Jean
>
>

Thanks Jean, for looking into this, and for the MWE.

--
Knute Snortum