Issue 270 in project lilypond

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Issue 270: bus error old scheme example piano spacing
http://code.google.com/p/lilypond/issues/detail?id=270

New issue report by gpermus:
 
\version "2.11.11"

\header { texidoc = "
<p>It is possible to have different staff distances between
the staffs of a piano system, but it requires some advanced Scheme code. 
Currently, this is for testing purposes.  
" }

#(define ((futz-alignment-callback distance count) grob axis)

   "Check if we're the system number COUNT, and if yes, set fixed distance 
to
DISTANCE; then call the original callback.  "
   (let*
       ((a (ly:grob-parent grob axis))
        (o (ly:grob-original a))
        (bs (if (ly:grob? o)
                (ly:spanner-broken-into o)
                #f))
        )


     (if (and (list? bs)
              (< count (length bs))
              (equal? (list-ref bs count) a)
         )
         (ly:grob-set-property! a 'forced-distance distance))
     
     (Align_interface::fixed_distance_alignment_callback grob axis)) )

\score {
     \relative c''  \context PianoStaff
    \with {
        verticalAlignmentChildCallback = #(futz-alignment-callback 20 1)

        %% Every cross staff beam will trigger
        %% alignment unless autokneeing is switched off 
        \override Beam #'auto-knee-gap = #'()
    } <<

        \context Staff = "up" {
            
            \time 2/4 
            c8[
                \change Staff = down
                \once \override Stem #'direction = #UP
                c8
                \change Staff = up
                c c ](
            |
            \break
            
            c8[)
                \change Staff = down
                \once \override Stem #'direction = #UP
                c8
                \change Staff = up
                c c ](
        }
        \context Staff = "down" {
            \skip 1 }

    >>
}


Issue attributes:
        Status: Accepted
        Owner: gpermus
        Labels: Type-Defect Priority-High

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