runtime: Set b:undo_indent where missing (#12944)
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/indent/dune.vim b/runtime/indent/dune.vim
index 0590d66..a9349e4 100644
--- a/runtime/indent/dune.vim
+++ b/runtime/indent/dune.vim
@@ -3,6 +3,7 @@
" Maintainers: Markus Mottl <markus.mottl@gmail.com>
" URL: https://github.com/ocaml/vim-ocaml
" Last Change: 2021 Jan 01
+" 2023 Aug 28 by Vim Project (undo_indent)
if exists("b:did_indent")
finish
@@ -11,3 +12,5 @@
" dune format-dune-file uses 1 space to indent
setlocal softtabstop=1 shiftwidth=1 expandtab
+
+let b:undo_indent = "setl et< sts< sw<"