commit d3de178e5352fedf0f30b979f46a2fcbca24ea40
author zeertzjq <zeertzjq@outlook.com> Thu Sep 01 12:58:52 2022 +0100
committer Bram Moolenaar <Bram@vim.org> Thu Sep 01 12:58:52 2022 +0100
tree a9bf6b52c8a69cd45d2e16c16265a89e7f5b1bf8
parent d83392a43a48c566c0f3b76382a3648584dae32b

patch 9.0.0346: :horizontal modifier not fully supported

Problem:    :horizontal modifier not fully supported.
Solution:   Also use :horizontal for completion and user commands.
            (closes #11025)

src/testdir/test_cmdline.vim

diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 95db663..bec0f5f 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -1078,6 +1078,10 @@
   call feedkeys(":all abc\<C-A>\<C-B>\"\<CR>", 'xt')
   call assert_equal("\"all abc\<C-A>", @:)
 
+  " completion for :wincmd with :horizontal modifier
+  call feedkeys(":horizontal wincm\<C-A>\<C-B>\"\<CR>", 'xt')
+  call assert_equal("\"horizontal wincmd", @:)
+
   " completion for a command with a command modifier
   call feedkeys(":topleft new\<C-A>\<C-B>\"\<CR>", 'xt')
   call assert_equal("\"topleft new", @:)