Issue 1975 in lilypond: VerticalAxisGroup staff-staff-spacing gets insane spring distances

[lilypond]

Status: New
Owner: address@hidden
Labels: Type-Critical

New issue 1975 by address@hidden: VerticalAxisGroup staff-staff-spacing  
gets insane spring distances
http://code.google.com/p/lilypond/issues/detail?id=1975

In the snippet below, there's a line to comment in and out to see a  
regression in 2.15.15.

With the line commented out, 2.14.0 and 2.15.15 give similar results.  WIth  
the line uncommented, you get an insane spring in 2.15.15 whereas the  
output is unaffected (or, if affected,  
not-visibly-upon-first-glance-affected) in 2.14.0.

NB: The top-level markup in the last line of the snippet exists to stop the  
staff from squishing.

***

\version "2.14.0"

soprano = \relative c' {
  \time 8/4
  f
  \stopStaff
  \once \override Staff . StaffSymbol #'line-count = #1
  \once \override Staff . StaffSymbol #'transparent = ##t
  \startStaff
  s1 s2.
  \stopStaff
  \startStaff
  a2^\ff_"foo" a a a |
}

middle = {
  s2
  s4^\markup { "text" }
  s1
  %\bar "" %%%%% UNCOMMENT ME TO SEE A REGRESSION
  s4
  s1 s1
}

\score {
  \new ChoirStaff <<
    \new Staff { \soprano }
    \new Staff { \soprano }
    \new Dynamics { \middle }
    \new Staff { \soprano }
    \new Staff { \soprano }
  >>
}
\markup { text }