Update runtime files
diff --git a/runtime/indent/idlang.vim b/runtime/indent/idlang.vim
index e6a1d73..1519865 100644
--- a/runtime/indent/idlang.vim
+++ b/runtime/indent/idlang.vim
@@ -2,7 +2,7 @@
" Language: IDL (ft=idlang)
" Maintainer: Aleksandar Jelenak <ajelenak AT yahoo.com> (Invalid email address)
" Doug Kearns <dougkearns@gmail.com>
-" Last change: 2017 Jun 13
+" Last change: 2022 Apr 06
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
@@ -14,6 +14,8 @@
setlocal indentexpr=GetIdlangIndent(v:lnum)
+let b:undo_indent = "setl inde< indk<"
+
" Only define the function once.
if exists("*GetIdlangIndent")
finish