Comment #13 on issue 1228 by [email protected]: \override RestCollision #'positioning-done = #merge-rests-on-positioning
http://code.google.com/p/lilypond/issues/detail?id=1228
Latest version of Jay's Merge Rests Engraver: http://lists.gnu.org/archive/html/lilypond-user/2012-02/msg00793.html
