Update runtime files
diff --git a/runtime/indent/sml.vim b/runtime/indent/sml.vim
index e760a8e..a0b0c3e 100644
--- a/runtime/indent/sml.vim
+++ b/runtime/indent/sml.vim
@@ -7,10 +7,11 @@
" Mike Leary <leary@nwlink.com>
" Markus Mottl <markus@oefai.at>
" OCaml URL: http://www.oefai.at/~markus/vim/indent/ocaml.vim
-" Last Change: 2003 Jan 04 - Adapted to SML
+" Last Change: 2022 Apr 06
" 2002 Nov 06 - Some fixes (JY)
" 2002 Oct 28 - Fixed bug with indentation of ']' (MM)
" 2002 Oct 22 - Major rewrite (JY)
+" 2022 April: b:undo_indent added by Doug Kearns
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
@@ -26,6 +27,8 @@
setlocal textwidth=80
setlocal shiftwidth=2
+let b:undo_indent = "setl et< inde< indk< lisp< si< sw< tw<"
+
" Comment formatting
if (has("comments"))
set comments=sr:(*,mb:*,ex:*)