patch 8.1.1711: listener callback called at the wrong moment commit https://github.com/vim/vim/commit/acf7544cf62227972eeb063d6d9ecddaa5682a73 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jul 17 22:55:35 2019 +0200 patch 8.1.1711: listener callback called at the wrong moment Problem: Listener callback called at the wrong moment Solution: Invoke listeners before calling ml_delete_int(). (closes https://github.com/vim/vim/issues/4657)

" 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