Add test for collisions and grace notes.

diff --git a/input/regression/beam-collision-grace.ly b/input/regression/beam-collision-grace.ly
new file mode 100644 (file)
index 0000000..49d0389
--- /dev/null
+++ b/input/regression/beam-collision-grace.ly
@@ -0,0 +1,13 @@
+
+
+\version "2.13.49"
+
+\header { texidoc = "
+The beaming algorithm handles collisions between beams and
+grace notes too.
+" }
+
+\relative c' {
+ e'8[ f  e \grace { f,16[ a] } e'8]
+}
+