patch 8.2.0554: the GUI doesn't set t_Co
Problem: The GUI doesn't set t_Co.
Solution: In the GUI set t_Co to 256 * 256 * 256. (closes #5903)
diff --git a/src/testdir/test_gui.vim b/src/testdir/test_gui.vim
index af4ce24..384209f 100644
--- a/src/testdir/test_gui.vim
+++ b/src/testdir/test_gui.vim
@@ -31,6 +31,8 @@
endfunc
func Test_colorscheme()
+ call assert_equal('16777216', &t_Co)
+
let colorscheme_saved = exists('g:colors_name') ? g:colors_name : 'default'
let g:color_count = 0
augroup TestColors