neovim/runtime/ftplugin/help.vim

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" Vim filetype plugin file
" Language: Vim help file
" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
" Latest Revision: 2018-12-29
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 fo< tw< cole< cocu< keywordprg<"
setlocal formatoptions+=tcroql textwidth=78
if has("conceal")
setlocal cole=2 cocu=nc
endif
" Prefer Vim help instead of manpages.
setlocal keywordprg=:help
let &cpo = s:cpo_save
unlet s:cpo_save