patch 8.2.0077: settagstack() cannot truncate at current index Commit: https://github.com/vim/vim/commit/271fa08a35b8d320d3a40db4ddae83b698fdd4fb Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 2 14:02:16 2020 +0100 patch 8.2.0077: settagstack() cannot truncate at current index Problem: settagstack() cannot truncate at current index. Solution: Add the "t" action. (Yegappan Lakshmanan, closes https://github.com/vim/vim/issues/5417)

" 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