Issue 800 in lilypond: Melismas extenders are broken when there's another staff

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Status: Accepted
Owner: v.villenave
CC: nicolas.sceaux
Labels: Type-Defect Priority-Medium

New issue 800 by v.villenave: Melismas extenders are broken when there's  
another staff
http://code.google.com/p/lilypond/issues/detail?id=800

% New report from Nicolas Sceaux:

%{
In case of multiple vocal staves, __ extender lines in melisma may be  
broken,
as is shown in the following example:
%}
\version "2.13.1"

staffA=\new Staff <<
 \new Voice = "A" \with { autoBeaming = ##f } {
   g'4. \melisma g'8 g'2 g' \melismaEnd g'
 }
 \lyricsto "A" \new Lyrics \lyricmode { bla __ bla }


staffB=\new Staff <<
 \new Voice = "B" \with { autoBeaming = ##f } {
   c'4 c' c' c' c' c' c' c'
 }
 \lyricsto "B" \new Lyrics \lyricmode {
   bla blu bli blo bla blu bli blo
 }


%% Melisma as expected
{ \staffA }

%% Broken melisma
<< \staffA \staffB >>

% Neil added some comments:
"
Caused by this commit, 7531ea6b3bb254f4d82aabde347a91671533b45a,
though I can't work out why that should break when there's a voice in
a lower stave.

For some reason, melisma_busy (voice) can't see that melismaBusy = ##t
in Voice "A".

There's another bug here too: `bla_' should be left-aligned.
"

Attachments:
        melisma1.png  2.1 KB
        melisma2.png  5.5 KB

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