patch 8.0.1521: Shift-Tab does not work in a terminal window commit https://github.com/vim/vim/commit/73cddfd559152ea9b7e978ea7cf9c0d3a41e7316 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Feb 16 20:01:04 2018 +0100 patch 8.0.1521: Shift-Tab does not work in a terminal window Problem: Shift-Tab does not work in a terminal window. Solution: Recognize Shift-Tab key press. (Jsees Luehrs, closes https://github.com/vim/vim/issues/2644)

" 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