Issue 1309 in lilypond: Consecutive interrupted lyrics from different staves are no longer aligned

[lilypond]

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

New issue 1309 by v.villenave: Consecutive interrupted lyrics from  
different staves are no longer aligned
http://code.google.com/p/lilypond/issues/detail?id=1309

This was reported by Dmytro months ago:
http://old.nabble.com/Re%3A--2.13--Problem-with-two-consecutive-interruped-lyrics-ts27527839.html

%% Consider the following example:

melody = \relative c'' {
  c c c c
}

upperLyr = \lyricmode {
  la la _ _
}

lowerLyr = \lyricmode {
  _ _ la la
}

\score {
  \new ChoirStaff <<
    \new Staff = "upper" {
      \new Voice = "upper" {
        \melody
      }
    }
    \new Lyrics \lyricsto "upper" \upperLyr
    \new Staff = "lower" {
      \new Voice = "lower" {
        \melody
      }
    }
    \new Lyrics \with {
      alignAboveContext = "lower"
    } \lyricsto "lower" \lowerLyr
  >>
}

%% Attached is the output of version 2.12: as you can see the first
%% and the seconf part of the lyrics share the same baseline.  This is
%% no longer the case with recent versions, where lyrics from different
%% contexts are not compressed into a single lyrics line.

Dmytro and Reinhold have both mentioned that this problem affects  
real-world scores too.

Attachments:
        twolyrics-2.12.3.png  4.0 KB
        twolyrics-2.13.12.png  4.5 KB
        twolyrics-2.13.36.png  3.9 KB