patch 9.1.1391: Vim does not have a vertical tabpanel

Problem:  Vim does not have a tabpanel
Solution: include the tabpanel feature
          (Naruhiko Nishino, thinca)

closes: #17263

Co-authored-by: thinca <thinca@gmail.com>
Signed-off-by: Naruhiko Nishino <naru123456789@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 68933a3..9a3fe20 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -4345,4 +4345,9 @@
   set wildoptions&
 endfunc
 
+func Test_redrawtabpanel_error()
+  CheckNotFeature tabpanel
+  call assert_fails(':redrawtabpanel', 'E1547:')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab