Make merge rests on positioning work

[Xavier Scheuer]

Hi,

Someone on the French users mailing list basically wants the features of
  \override RestCollision #'positioning-done = #merge-rests-on-positioning

Issue #1228 is tagged as "Patch-abandoned", LSR #336 is not working
with current version.
http://code.google.com/p/lilypond/issues/detail?id=1228
http://lsr.dsi.unimi.it/LSR/Item?id=336

However, the code given by Wilbert in the first comment works, except
that the MMRs appears below the 3rd (middle) line, instead of below the
4th line (normal position).  Apparently
  MultiMeasureRest #'staff-position  changed from #0 to #2 for the
normal position between 2.12 and 2.14/2.15.

Could a "power user" give some help in order to make it work correctly
with 2.14/2.15?  Even better if a dev could implement it (correctly) in
LilyPond, but in the meantime I'm sure the French users would be happy
with a hack!
http://codereview.appspot.com/4005046/
http://lists.gnu.org/archive/html/bug-lilypond/2011-03/msg00291.html

Thanks in advance.

Cheers,
Xavier

-- 
Xavier Scheuer <address@hidden>