From f270fa5302a3d084f8f0a897403efca46f2e15ec Mon Sep 17 00:00:00 2001
From: Valentin Villenave <valentin@villenave.net>
Date: Sun, 13 Jan 2008 19:01:45 +0100
Subject: [PATCH] fix input regression cluster cross-staff.ly

---
 lily/cluster.cc         | 12 ++++++++++++
 lily/include/cluster.hh |  1 +
 scm/define-grobs.scm    |  1 +
 3 files changed, 14 insertions(+)

diff --git a/lily/cluster.cc b/lily/cluster.cc
index 7a84195493..c4b11b38c5 100644
--- a/lily/cluster.cc
+++ b/lily/cluster.cc
@@ -111,6 +111,18 @@ brew_cluster_piece (Grob *me, vector<Offset> bottom_points, vector<Offset> top_p
   return out;
 }
 
+MAKE_SCHEME_CALLBACK (Cluster, calc_cross_staff, 1);
+SCM
+Cluster::calc_cross_staff (SCM smob)
+{
+  Grob *me = unsmob_grob (smob);
+
+  extract_grob_set (me, "columns", cols);
+  Grob *commony = common_refpoint_of_array (cols, me, Y_AXIS);
+
+  return scm_from_bool (commony != me->get_parent (Y_AXIS));
+}
+
 MAKE_SCHEME_CALLBACK (Cluster, print, 1);
 SCM
 Cluster::print (SCM smob)
diff --git a/lily/include/cluster.hh b/lily/include/cluster.hh
index 3081b1b093..e15d002414 100644
--- a/lily/include/cluster.hh
+++ b/lily/include/cluster.hh
@@ -16,6 +16,7 @@ class Cluster
 {
 public:
   DECLARE_SCHEME_CALLBACK (print, (SCM));
+  DECLARE_SCHEME_CALLBACK (calc_cross_staff, (SCM));
   DECLARE_GROB_INTERFACE();
 };
 
diff --git a/scm/define-grobs.scm b/scm/define-grobs.scm
index 800362eb92..658d2dfeb0 100644
--- a/scm/define-grobs.scm
+++ b/scm/define-grobs.scm
@@ -486,6 +486,7 @@
 	(stencil . ,ly:cluster::print)
 	(minimum-length . 0.0)
 	(padding . 0.25)
+	(cross-staff . ,ly:cluster::calc-cross-staff)
 	(style . ramp)
 	(meta . ((class . Spanner)
 		 (interfaces . (cluster-interface))))))
-- 
2.39.2