Commit: runtime(rst): Update b:undo_ftplugin variable

[Christian Brabandt]

runtime(rst): Update b:undo_ftplugin variable

Commit: https://github.com/vim/vim/commit/5ffb23c967189585b74bb9a031caf3b6ef7cce9c
Author: Doug Kearns <dougk...@gmail.com>
Date: Mon Oct 13 18:34:47 2025 +0000

runtime(rst): Update b:undo_ftplugin variable

The value of this variable is evaluated when the 'filetype' option is
changed and should be a command string that will undo any configuration
changes that the plugin has made.

See :help undo_indent for details

related: #18566

Signed-off-by: Doug Kearns <dougk...@gmail.com>
Signed-off-by: Marshall Ward <marsha...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/rst.vim b/runtime/ftplugin/rst.vim
index c88e8f258..887f64bb4 100644
--- a/runtime/ftplugin/rst.vim
+++ b/runtime/ftplugin/rst.vim
@@ -4,6 +4,7 @@
" Original Maintainer: Nikolai Weibull <n...@bitwi.se>
" Website: https://github.com/marshallward/vim-restructuredtext
" Latest Revision: 2020-03-31
+" 2025 Oct 13 by Vim project: update b:undo_ftplugin #18566

if exists("b:did_ftplugin")
finish
@@ -18,7 +19,7 @@ if !exists('g:rst_fold_enabled')
let g:rst_fold_enabled = 0
endif

-let b:undo_ftplugin = "setl com< cms< et< fo<"
+let b:undo_ftplugin = "setlocal comments< commentstring< expandtab< formatoptions<"

setlocal comments=fb:.. commentstring=..\ %s expandtab
setlocal formatoptions+=tcroql
@@ -32,15 +33,17 @@ setlocal formatoptions+=tcroql

if exists("g:rst_style") && g:rst_style != 0
setlocal expandtab shiftwidth=3 softtabstop=3 tabstop=8
+ let b:undo_ftplugin .= " | setlocal softtabstop< shiftwidth< tabstop<"
endif

-if g:rst_fold_enabled != 0 && has('patch-7.3.867') " Introduced the TextChanged event.
+if g:rst_fold_enabled != 0
setlocal foldmethod=expr
setlocal foldexpr=RstFold#GetRstFold()
setlocal foldtext=RstFold#GetRstFoldText()
augroup RstFold
autocmd TextChanged,InsertLeave <buffer> unlet! b:RstFoldCache
augroup END
+ let b:undo_ftplugin .= " | setlocal foldexpr< foldmethod< foldtext<"
endif

let &cpo = s:cpo_save