commit https://github.com/vim/vim/commit/5c71994f4ee5f87d4cce990dbc9684c70b1e108b Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jul 9 23:40:45 2016 +0200 patch 7.4.2015 Problem: When a file gets a name when writing it 'acd' is not effective. (Dan Church) Solution: Invoke DO_AUTOCHDIR after writing the file. (Allen Haim, closes #777, closes #803) Add test_autochdir() to enable 'acd' before "starting" is reset.

" 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