commit https://github.com/vim/vim/commit/ded2782783f352201ac0b05c6dbe4831adb4a58b Author: Bram Moolenaar <Bram@vim.org> Date: Mon Jan 2 14:27:34 2017 +0100 patch 8.0.0135 Problem: An address relative to the current line, ":.,+3y", does not work properly on a closed fold. (Efraim Yawitz) Solution: Correct for including the closed fold. (Christian Brabandt)

" 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