patch 8.1.0506: modeline test fails when run by root commit https://github.com/vim/vim/commit/9691f82f862ed18c2e3e48f9d2cd902bb947f803 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 3 19:06:25 2018 +0100 patch 8.1.0506: modeline test fails when run by root Problem: Modeline test fails when run by root. Solution: Set 'modeline' for the test. (James McCoy, closes https://github.com/vim/vim/issues/3592)

" 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