Re: Misplaced dashed barlines in vertically compressed score

[William Rehwinkel]

Thank you for your help on this, Harm.

For now I'll use the workaround of using dotted as opposed to dashed 
barlines. (These can be changed back via sed later).

-William

On 6/13/22 20:02, Thomas Morley wrote:
> Am Di., 14. Juni 2022 um 01:25 Uhr schrieb Thomas Morley
> <thomasmorley65@gmail.com>:
> > Am Mo., 13. Juni 2022 um 19:39 Uhr schrieb William Rehwinkel via
> > bug-lilypond <bug-lilypond@gnu.org>:
> > > Dear Lilypond,
> > >
> > > After not being able to find any bugs discussing this in the tracker, I
> > > would like to share the following miniature example which I believe
> > > shows that dashed bar-lines are misplaced in vertically compressed
> > > scores (using default lilypond spacing settings). After testing in
> > > 2.22.2 and 2.23.9, the same behavior persists. The dashed lines should
> > > have rendered in the same way as the double bar and dotted bar did, but
> > > it does not connect between the two Piano Staves and extends above the
> > > top staff. Note that if the spacing of systems is manually expanded, via
> > > "\paper{ systems-per-page = 4 }", for example, the dashed bar-lines are
> > > rendered properly.
> > >
> > > Thank you,
> > >
> > > -William
> > >
> > > ---
> > >
> > > \version "2.23.9" % "2.22.2"
> > > \score {
> > >       <<
> > >           \new PianoStaff <<
> > >               \new Staff \repeat unfold 32 { 8 8 8 8 \bar "!" 8 8 8 8
> > > \bar "||" 8 8 8 8 \bar ";" 8 8 8 8 }
> > >               \new Staff \repeat unfold 32 { 8 8 8 8 8 8 8 8 8 8 8 8 8 8
> > > 8 8 }
> > >           >>
> > >           \new Staff \repeat unfold 32 { 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 }
> > >       >>
> > > }
> > Confirmed.
> >
> > Here a more tiny example:
> >
> > mus = {
> >    \override Staff.BarLine.bar-extent =
> >      #(lambda (grob) (interval-widen (ly:bar-line::calc-bar-extent grob) 0.5))
> >
> >    f'4 \bar "!" f''4
> > }
> >
> > \new PianoStaff
> >    <<
> >        \new Staff \mus
> >        \new Staff \mus
> >    >>
> >
> > Actually a dashed bar line uses dashed-line _or_ a line constructed
> > from filled boxes, depending on certain conditions.
> > Iirc, this is due to wished different behaviour if BarLine.color is
> > different from StaffSymbol.color. I may be wrong here though...
> >
> > If a _SpanBar_ is dashed with filled boxes the result needs to be
> > moved between the staves.Though, this is a very rare case and not
> > covered by any regtest afaict, thus it was undetected so far.
> >
> > Many thanks for your report.
> > On it ...
> >
> > Cheers,
> >    Harm
> https://gitlab.com/lilypond/lilypond/-/merge_requests/1408
> is a basic fix.
> Probably it should be amended by a regtest triggering the problem ...
>
> Cheers,
>    Harm

--
William Rehwinkel

william@williamrehwinkel.net
https://williamrehwinkel.net