patch 9.1.0277: Cannot highlight the Command-line

Problem:  Cannot highlight the Command-line
Solution: Add the MsgArea highlighting group
          (Shougo Matsushita)

closes: #14327

Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index d6c9f50..9bc5f12 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -856,6 +856,15 @@
   hi clear
 endfunc
 
+" Test for MsgArea highlighting
+func Test_highlight_MsgArea()
+  CheckNotGui
+  hi MsgArea ctermfg=20
+  redraw!
+  call assert_equal('20', synIDattr(synIDtrans(hlID('MsgArea')), 'fg'))
+  hi clear
+endfunc
+
 " Test for using RGB color values in a highlight group
 func Test_xxlast_highlight_RGB_color()
   CheckCanRunGui