patch 8.1.0570: 'commentstring' not used when adding fold marker commit https://github.com/vim/vim/commit/539328197c51c1586cbbb6b6be3db3c412249b49 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 7 21:08:49 2018 +0100 patch 8.1.0570: 'commentstring' not used when adding fold marker Problem: 'commentstring' not used when adding fold marker. (Maxim Kim) Solution: Only use empty 'comments' middle when leader is empty. (Christian Brabandt, closes #3670)

" Vim filetype plugin file
" Language:	Diff
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2005 Jul 27

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl modeline<"

" Don't use modelines in a diff, they apply to the diffed file
setlocal nomodeline