Issue 913: improve \partcombine when parts have unequal lengths

Add terminal entries to Voice-state arrays at the moment the last
event ends.

This also improves Issue 1677 by engraving notes that were missing;
however, it does not resolve it because the rests are still wrong.

1 files changed, 14 insertions, 0 deletions

diff --git a/input/regression/part-combine-unequal-lengths.ly b/input/regression/part-combine-unequal-lengths.ly
new file mode 100644
index 0000000000..b21a2aa965
--- /dev/null
+++ b/input/regression/part-combine-unequal-lengths.ly
@@ -0,0 +1,14 @@
+\version "2.19.28"
+
+\header {
+  texidoc ="The part combiner can combine parts of unequal lengths."
+}
+
+\layout { ragged-right = ##t }
+
+\new Staff { %% based on the example in Issue 913
+  c'1
+  \partcombine { e' r } { c' }
+  \partcombine { b' } {}
+  \partcombine {} { f' }
+}