Re: Issue 1321 in lilypond: Enhancement: add partcombineUp and partcombineDown functions

[lilypond]

Comment #1 on issue 1321 by address@hidden: Enhancement: add  
partcombineUp and partcombineDown functions
http://code.google.com/p/lilypond/issues/detail?id=1321

Potential fix :
http://codereview.appspot.com/4514042/
This is more a draft than anything else.
It doesn't work properly with four voices :
<< \partcombineUp \one \two \partcombineDown \three \four >>
But this works great :

soprano = { d''2 f'' g'' }
alto = { a' c''4 d'' e''2 }
basso = { d'4 e' f' g' g'2 }

\new Staff << \partcombineUp \soprano \alto \\ \basso >>

Regards,
Bertrand