Update runtime files
diff --git a/runtime/ftplugin/c.vim b/runtime/ftplugin/c.vim
index 70e54b3..b6aed9c 100644
--- a/runtime/ftplugin/c.vim
+++ b/runtime/ftplugin/c.vim
@@ -1,7 +1,7 @@
" Vim filetype plugin file
" Language: C
" Maintainer: Bram Moolenaar <Bram@vim.org>
-" Last Change: 2020 Feb 01
+" Last Change: 2021 Sep 21
" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
@@ -40,8 +40,11 @@
" When the matchit plugin is loaded, this makes the % command skip parens and
" braces in comments properly.
-let b:match_words = '^\s*#\s*if\(\|def\|ndef\)\>:^\s*#\s*elif\>:^\s*#\s*else\>:^\s*#\s*endif\>'
-let b:match_skip = 's:comment\|string\|character\|special'
+if !exists("b:match_words")
+ let b:match_words = '^\s*#\s*if\(\|def\|ndef\)\>:^\s*#\s*elif\>:^\s*#\s*else\>:^\s*#\s*endif\>'
+ let b:match_skip = 's:comment\|string\|character\|special'
+ let b:undo_ftplugin ..= " | unlet! b:match_skip b:match_words"
+endif
" Win32 can filter files in the browse dialog
if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
@@ -62,6 +65,7 @@
\ "C++ Source Files (*.cpp *.c++)\t*.cpp;*.c++\n" .
\ "All Files (*.*)\t*.*\n"
endif
+ let b:undo_ftplugin ..= " | unlet! b:browsefilter"
endif
let &cpo = s:cpo_save