patch 9.0.1442: mapset() does not restore non-script context Commit: https://github.com/vim/vim/commit/bfc7cbd1d44e53e844a079d8ad16ae990dad664d Author: zeertzjq <zeertzjq@outlook.com> Date: Fri Apr 7 22:09:46 2023 +0100 patch 9.0.1442: mapset() does not restore non-script context Problem: mapset() does not restore non-script context. Solution: Also accept negative sid. (closes https://github.com/vim/vim/issues/12132)

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s