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)

" Tests for :undo

func Test_ex_undo()
  new ex-undo
  setlocal ul=10
  exe "normal ione\n\<Esc>"
  setlocal ul=10
  exe "normal itwo\n\<Esc>"
  setlocal ul=10
  exe "normal ithree\n\<Esc>"
  call assert_equal(4, line('$'))
  undo
  call assert_equal(3, line('$'))
  undo 1
  call assert_equal(2, line('$'))
  undo 0
  call assert_equal(1, line('$'))
  quit!
endfunc