Change the behavior of nested StaffGroupers.

[lilypond.git] / lily / vertical-align-engraver.cc

diff --git a/lily/vertical-align-engraver.cc b/lily/vertical-align-engraver.cc
index e09d7f23c105e656f9d5ad107a811892ad5e28a9..9a6e3afa30c8e58aff8e92e3168c23d504fa3755 100644 (file)
--- a/lily/vertical-align-engraver.cc
+++ b/lily/vertical-align-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -166,6 +166,7 @@ Vertical_align_engraver::acknowledge_axis_group (Grob_info i)
   else if (qualifies (i))
     {
       Pointer_group_interface::add_grob (valign_, ly_symbol2scm ("elements"), i.grob ());
-      i.grob ()->set_object ("staff-grouper", valign_->self_scm ());
+      if (!unsmob_grob (i.grob ()->get_object ("staff-grouper")))
+       i.grob ()->set_object ("staff-grouper", valign_->self_scm ());
     }
 }