Update runtime files
diff --git a/runtime/indent/prolog.vim b/runtime/indent/prolog.vim
index ac03c28..0c4fd54 100644
--- a/runtime/indent/prolog.vim
+++ b/runtime/indent/prolog.vim
@@ -4,6 +4,7 @@
" Doug Kearns <dougkearns@gmail.com>
" Revised on: 2002.02.18. 23:34:05
" Last change by: Takuya Fujiwara, 2018 Sep 23
+" 2022 April: b:undo_indent added by Doug Kearns
" TODO:
" checking with respect to syntax highlighting
@@ -21,6 +22,8 @@
setlocal indentkeys-=:,0#
setlocal indentkeys+=0%,-,0;,>,0)
+let b:undo_indent = "setl inde< indk<"
+
" Only define the function once.
"if exists("*GetPrologIndent")
" finish