commit f708ac592f47100a36f2bc12ec98ea6357fdfa27
author Bram Moolenaar <Bram@vim.org> Mon Mar 12 21:48:32 2018 +0100
committer Bram Moolenaar <Bram@vim.org> Mon Mar 12 21:48:32 2018 +0100
tree d7344fd69b4d52c81288b2d2881a3f625e04e70b
parent 3e4b84d0b55936ac017d20df6651ddd05e38f58f

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 #2710)

src/testdir/test_highlight.vim

diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index f3d7d0f..0c4be7b 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -514,3 +514,17 @@
   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