updated for version 7.4.057
Problem:    byteidx() does not work for composing characters.
Solution:   Add byteidxcomp().
diff --git a/src/testdir/test69.ok b/src/testdir/test69.ok
index f742ee1..1ff82f2 100644
--- a/src/testdir/test69.ok
+++ b/src/testdir/test69.ok
@@ -149,3 +149,11 @@
 aaaa
 aaa
 
+
+byteidx
+[0, 1, 3, 4, -1]
+[0, 1, 4, 5, -1]
+byteidxcomp
+[0, 1, 3, 4, -1]
+[0, 1, 2, 4, 5, -1]
+