Re: Vertical spacing regression !?

[Joe Neeman]

On Thu, 2010-06-24 at 14:05 +0200, Arno Waschk wrote:
> 
> On Sun, 20 Jun 2010 18:41:47 +0200, Joe Neeman <address@hidden> wrote:
> 
> > On Sun, 2010-06-20 at 16:19 +0200, Arno Waschk wrote:
> >> dear list,
> >>
> >> the following:
> >>
> >>
> >> \version "2.13.23"
> >> \include "deutsch.ly"
> >> TempoMark={ \time 4/4 \repeat unfold 20 {s1*5 \mark \default} }
> >>
> >> celloPart = \new Staff \with {} { \relative c''{  \repeat unfold 19
> >> {\repeat unfold 5{c8[c c c c c c c]}
> >>        \mark "BLABLA"
> >>      } c1 }}
> >>
> >> rechtsPart = \new Staff \with {} {\relative c'{ \repeat unfold 399 {c4}
> >> f4  }}
> >>
> >> linksPart = \relative c, {s1*100}
> >> #(set-global-staff-size 22.5)
> >> \score {
> >>   <<
> >>    \celloPart
> >>    \rechtsPart
> >> >>
> >>    \layout {
> >>      \context{\RemoveEmptyStaffContext
> >>        \override VerticalAxisGroup #'remove-first = ##t
> >> } } }
> >>
> >> gives here (latest lilypond from git as of 20th June 2010 3pm MESZ) the
> >> problem of three warnings "couldn't fit music on page",
> >> and the last systems of page 2 and 3 being cut off by the lower end of  
> >> the
> >> paper.
> >>
> >> this disappear when one either comments out the "\mark ..." line, or  
> >> uses
> >> lilypond 2.12.
> >>
> >> this seems like a regression bug, no?
> >>
> >> could not yet find something similar on the issue tracker.
> >
> > I'm pretty sure this is an instance of bug 1062.
> >
> > Cheers,
> > Joe
> >
> 
> Hi, is there a workaround other than downgrading to 2.13.18?

You can always use page-breaking-between-system-spacing to fool the page
breaker into using more pages:
\paper {
  page-breaking-between-system-spacing #'padding = #5
}

Or you can set max-systems-per-page, or add a manual page break. Or you
can wait until 2.13.26, since the bug is fixed in git.

> I mean, couldn't Lilypond easily push the last line on the next page when
> the "couldn't fit music on page" warning is issued, until the whole thing
> is solved completely?

In specific situations, maybe, but lilypond can't do it in general
without breaking \pageBreak, min-systems-per-page, page-count and other
commands.

> The annotate-spacing output (for me) seems to show that lilypond is aware
> of correct spacing anyway...

Yes, but we don't know the _exact_ height of each system until after
page-breaking is done (otherwise, we would have to do all the layout for
every conceivable page-breaking solution and that would take far too
long).

Cheers,
Joe