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 syntax file
" Language:  systemd.unit(5)

if !exists('b:current_syntax')
  " Looks a lot like dosini files.
  runtime! syntax/dosini.vim
  let b:current_syntax = 'systemd'
endif