From e105e1242a87ed413190ca213c4944393e6089b3 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <janedmundlazo@hotmail.com>
Date: Sat, 14 Jul 2018 14:29:53 -0400
Subject: [PATCH] vim-patch:8.0.1600: crash when setting t_Co to zero when
 'termguicolors' is set

Problem:    Crash when setting t_Co to zero when 'termguicolors' is set.
Solution:   Use IS_CTERM instead of checking the number of colors.
            (closes vim/vim#2710)
https://github.com/vim/vim/commit/f708ac592f47100a36f2bc12ec98ea6357fdfa27
---
 src/nvim/testdir/test_highlight.vim | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/nvim/testdir/test_highlight.vim b/src/nvim/testdir/test_highlight.vim
index 6ee994bb9a..ce6262c811 100644
--- a/src/nvim/testdir/test_highlight.vim
+++ b/src/nvim/testdir/test_highlight.vim
@@ -514,3 +514,17 @@ func Test_highlight_eol_on_diff()
   bwipe!
   diffoff
 endfunc
+
+func Test_termguicolors()
+  if !exists('+termguicolors')
+    return
+  endif
+
+  " Basic test that setting 'termguicolors' works with one color.
+  set termguicolors
+  redraw
+  set t_Co=1
+  redraw
+  set t_Co=0
+  redraw
+endfunc