beam: if cross-staff, do not use concaveness; issue 657

diff --git a/lily/beam-quanting.cc b/lily/beam-quanting.cc
index ac845103ea8f56c75d608da171224756b557314e..c590802675f8ac188a0c8e6e0df03f5e09a0aed4 100644 (file)
--- a/lily/beam-quanting.cc
+++ b/lily/beam-quanting.cc
@@ -651,7 +651,7 @@ Beam_scoring_problem::calc_concaveness ()
   if (scm_is_number (conc))
     return scm_to_double (conc);
 
-  if (is_knee_)
+  if (is_knee_ || is_xstaff_)
     return 0.0;
 
   Direction beam_dir = CENTER;