patch 8.1.0017: shell command completion has duplicates commit https://github.com/vim/vim/commit/62fe66f251263715968442e237742d9d3dfd5fa1 Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 22 16:58:47 2018 +0200 patch 8.1.0017: shell command completion has duplicates Problem: Shell command completion has duplicates. (Yegappan Lakshmanan) Solution: Use a hash table to avoid duplicates. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/539, closes #2733)

" Test feedkeys() function.

func Test_feedkeys_x_with_empty_string()
  new
  call feedkeys("ifoo\<Esc>")
  call assert_equal('', getline('.'))
  call feedkeys('', 'x')
  call assert_equal('foo', getline('.'))

  " check it goes back to normal mode immediately.
  call feedkeys('i', 'x')
  call assert_equal('foo', getline('.'))
  quit!
endfunc