patch 9.0.1215: using isalpha() adds dependency on current locale Commit: https://github.com/vim/vim/commit/0ef9a5c09482649cf0cc6768ed6fc640b4ed2a0a Author: zeertzjq <zeertzjq@outlook.com> Date: Tue Jan 17 21:38:25 2023 +0000 patch 9.0.1215: using isalpha() adds dependency on current locale Problem: Using isalpha() adds dependency on current locale. Solution: Do not use isalpha() for recognizing a URL or the end of an Ex command. (closes #11835)

" Vim filetype plugin file
" Language:             mutt RC File
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2006-04-19

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< inc< fo<"

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

let &l:include = '^\s*source\>'

let &cpo = s:cpo_save
unlet s:cpo_save