Avoids script-tie collisions

Ties are now issued at their correct beginning time step and
are suicided if they are ultimately unused.  This allows the
Script_engraver to acknowledge them at the correct timestep and
register them as supports for the side-position-interface.

1 files changed, 23 insertions, 0 deletions

diff --git a/input/regression/script-tie-collision.ly b/input/regression/script-tie-collision.ly
new file mode 100644
index 0000000000..0b1c837e0e
--- /dev/null
+++ b/input/regression/script-tie-collision.ly
@@ -0,0 +1,23 @@
+\version "2.17.2"
+
+\header {
+  texidoc = "Scripts avoid ties.
+"
+}
+
+% Managing what note heads' scripts have been accounted for in
+% the Tie_engraver is tricky.
+% This regtest tries to confuse it with various configurations
+% Of notes with and without ties, with multiple scripts, etc..
+
+\relative c''' {
+  r2. c4~-> | c-> r2. |
+  r2. c4-> | c-> r2. |
+  r2. c4~-> | c r2. |
+  r2. c4~ | c-> r2. | \break
+  r2. <g-- c-> >4--~ | <g-- c>-> ~ <g c---_>-> r2 |
+  r2. c4~ | c-> ~ c-> r2 |
+  r2. c4~-> | c ~ c-> r2 |
+  r2. c4~-> | c-> ~ c r2 |
+  r2. c4-> |
+}