commit https://github.com/vim/vim/commit/169ebb080454357279ad5ad21ac532deaec605e8 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Sep 7 23:32:23 2016 +0200 patch 7.4.2344 Problem: The "Reading from channel output..." message can be unwanted. Appending to a buffer leaves an empty first line behind. Solution: Add the "out_msg" and "err_msg" options. Writing the first line overwrites the first, empty line.

" Vim filetype plugin file
" Language:         m4
" Maintainer:       Nikolai Weibull <now@bitwi.se>
" Latest Revision:  2008-07-09

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

let s:cpo_save = &cpo
set cpo&vim

let b:undo_ftplugin = "setl com< cms< fo<"

setlocal comments=:#,:dnl commentstring=dnl\ %s
setlocal formatoptions-=t formatoptions+=croql

let &cpo = s:cpo_save
unlet s:cpo_save