patch 8.0.0347: when using completion comment leader wont work commit https://github.com/vim/vim/commit/d099e033703ce0772f152b8df8a763f0b65303ee Author: Bram Moolenaar <Bram@vim.org> Date: Tue Feb 21 23:00:36 2017 +0100 patch 8.0.0347: when using completion comment leader wont work Problem: When using CTRL-X CTRL-U inside a comment, the use of the comment leader may not work. (Klement) Solution: Save and restore did_ai. (Christian Brabandt, closes #1494)

" 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