knee_b fix

diff --git a/lily/beam.cc b/lily/beam.cc
index f1da1fec878804c4a41b296b3b4ee596dd866cd9..c2d024df6adba40cc5b8df8ef5126f07a7c4d469 100644 (file)
--- a/lily/beam.cc
+++ b/lily/beam.cc
@@ -488,10 +488,13 @@ Beam::set_stem_directions (Grob *me, Direction d)
         natural direction. In any case, when knee, beam direction is
         foe.
         
-        TODO: for x staff knees, set direction pointing to 'the other' staff, rather than natural.
+        TODO: for x staff knees, set direction pointing to 'the
+        other' staff, rather than natural.
       */
       if (knee_b(me))
-       Stem::get_direction (s); // this actually sets it, if necessary
+       {
+         Stem::get_direction (s); // this actually sets it, if necessary
+       }
       else
        {
          SCM force = s->remove_grob_property ("dir-forced");
@@ -1298,18 +1301,22 @@ Beam::knee_b (Grob*me)
   bool knee = false;
   int d = 0;
   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
-    if (d != Directional_element_interface::get (unsmob_grob (ly_car (s))))
-      {
-       knee = true;
-       break;
-      }
+    {
+      Direction dir = Directional_element_interface::get
+       (unsmob_grob (ly_car (s)));
+      if (d && d != dir)
+       {
+         knee = true;
+         break;
+       }
+      d = dir;
+    }
   
   me->set_grob_property ("knee", gh_bool2scm (knee));
 
   return knee;
 }
 
-
 ADD_INTERFACE (Beam, "beam-interface",
   "A beam.