patch 8.0.1446: acessing freed memory after window command in auto command commit https://github.com/vim/vim/commit/6f361c991221e96d5068c77b854967d997b1529b Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jan 31 19:06:50 2018 +0100 patch 8.0.1446: acessing freed memory after window command in auto command Problem: Acessing freed memory after window command in auto command. (gy741) Solution: Adjust the pointer in the parent frame. (Christian Brabandt, closes #2467)

" 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