patch 8.0.0983: unnecessary check for NULL pointer commit https://github.com/vim/vim/commit/3f9a1ff141412e9e85f7dff47d02946cb9be9228 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Aug 21 22:06:02 2017 +0200 patch 8.0.0983: unnecessary check for NULL pointer Problem: Unnecessary check for NULL pointer. Solution: Remove the NULL check in dialog_changed(), it already happens in dialog_msg(). (Ken Takata)

" 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