patch 7.4.786
Problem:    It is not possible for a plugin to adjust to a changed setting.
Solution:   Add the OptionSet autocommand event. (Christian Brabandt)
diff --git a/src/testdir/Make_vms.mms b/src/testdir/Make_vms.mms
index 1c6a56d..726c233 100644
--- a/src/testdir/Make_vms.mms
+++ b/src/testdir/Make_vms.mms
@@ -98,6 +98,7 @@
 	 test105.out test106.out test107.out \
 	 test_argument_0count.out \
 	 test_argument_count.out \
+	 test_autocmd_option.out \
 	 test_autoformat_join.out \
 	 test_breakindent.out \
 	 test_changelist.out \