patch 9.1.0568: Cannot expand paths from 'cdpath' setting

Problem:  Cannot expand paths from 'cdpath' setting
          (Daniel Hahler)
Solution: Implement 'cdpath' completion, add the new 'dir_in_path'
          completion type (LemonBoy)

fixes #374
closes: #15205

Signed-off-by: LemonBoy <thatlemon@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 8651a9d..f83d673 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -658,7 +658,8 @@
   unlet g:cmdline_compl_params
 
   " For others test if the name is recognized.
-  let names = ['buffer', 'environment', 'file_in_path', 'mapping', 'tag', 'tag_listfiles', 'user']
+  let names = ['buffer', 'environment', 'file_in_path', 'dir_in_path', 'mapping', 'tag',
+      \ 'tag_listfiles', 'user']
   if has('cmdline_hist')
     call add(names, 'history')
   endif