patch 8.0.0581: moving folded text is sometimes not correct commit https://github.com/vim/vim/commit/94be619e30e82d28cadeea5e0766c6f5c321ff8b Author: Bram Moolenaar <Bram@vim.org> Date: Sat Apr 22 22:40:11 2017 +0200 patch 8.0.0581: moving folded text is sometimes not correct Problem: Moving folded text is sometimes not correct. Solution: Bail out when "move_end" is zero. (Matthew Malcomson)

" 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