Issue 1560 in lilypond: Lyrics can not be aligned below ossia staff

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 1560 by brownian.box: Lyrics can not be aligned below ossia staff
http://code.google.com/p/lilypond/issues/detail?id=1560

Reported by Dénes Harmath,
http://lists.gnu.org/archive/html/bug-lilypond/2011-03/msg00082.html :

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alignBelowContext seems to be ignored in this case:

\score { <<
  \new Voice = melody {
    \relative c' {
      c4
      <<
        { c8 e }
        \new Staff = ossiaStaff {
                \new Voice = splitpart { c4 }
        }
      >>
      c4 c | c
    }
  }
  \new Lyrics \lyricsto melody { we shall not o- ver- come }
  \new Lyrics \with {
        alignBelowContext = #"ossiaStaff"
  } \lyricsto splitpart { will }
> > }

If I insert the ossia lyrics context in the inner parallel music  
expression, the output is erroneous as described in
http://lists.gnu.org/archive/html/lilypond-user/2011-03/msg00041.html:

\score{ <<
  \new Voice = melody {
    \relative c' {
      c4
      <<
        { c8 e }
        \new Staff = ossiaStaff {
                \new Voice = splitpart { c4 }
        }
        \new Lyrics \with {
                alignBelowContext = #"ossiaStaff"
        } \lyricsto splitpart { will }
      >>
      c4 c | c
    }
  }
  \new Lyrics \lyricsto melody { we shall not o- ver- come }
> > }

Can be reproduced with either 2.12.3 or with 2.13.52.
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