From d5ab4b800c321d6cdd2cb308a9cdbaa3fa66cd8d Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Sat, 12 Dec 2020 16:23:04 -0500
Subject: [PATCH] vim-patch:8.1.1089: tutor does not check $LC_MESSAGES

Problem:    Tutor does not check $LC_MESSAGES.
Solution:   Let $LC_MESSAGES overrule $LANG. (Miklos Vajna, closes vim/vim#4112)
https://github.com/vim/vim/commit/b44b7add8ae8e15328b4f68c3caf511bd9aaac8c
---
 runtime/autoload/tutor.vim | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/runtime/autoload/tutor.vim b/runtime/autoload/tutor.vim
index 3265fdde36..6afe64de84 100644
--- a/runtime/autoload/tutor.vim
+++ b/runtime/autoload/tutor.vim
@@ -120,6 +120,12 @@ function! s:Locale()
         let l:lang = v:lang
     elseif $LC_ALL =~ '\a\a'
         let l:lang = $LC_ALL
+    elseif $LC_MESSAGES =~ '\a\a' || $LC_MESSAGES ==# "C"
+      " LC_MESSAGES=C can be used to explicitly ask for English messages while
+      " keeping LANG non-English; don't set l:lang then.
+      if $LC_MESSAGES =~ '\a\a'
+        let l:lang = $LC_MESSAGES
+      endif
     elseif $LANG =~ '\a\a'
         let l:lang = $LANG
     else