runtime: Set b:undo_indent where missing (#12944)
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/indent/vhdl.vim b/runtime/indent/vhdl.vim
index ad31806..b01d115 100644
--- a/runtime/indent/vhdl.vim
+++ b/runtime/indent/vhdl.vim
@@ -3,6 +3,7 @@
" Maintainer: Gerald Lai <laigera+vim?gmail.com>
" Version: 1.62
" Last Change: 2017 Oct 17
+" 2023 Aug 28 by Vim Project (undo_indent)
" URL: http://www.vim.org/scripts/script.php?script_id=1450
" only load this indent file when no other was loaded
@@ -19,6 +20,8 @@
setlocal indentkeys+==~case,=~loop,=~for,=~generate,=~record,=~units,=~process,=~block,=~function,=~component,=~procedure
setlocal indentkeys+==~architecture,=~configuration,=~entity,=~package
+let b:undo_indent = "setlocal indentexpr< indentkeys<"
+
" constants
" not a comment
let s:NC = '\%(--.*\)\@<!'