patch 8.1.1746: ":dl" is seen as ":dlist" instead of ":delete" commit https://github.com/vim/vim/commit/94f82cbacf76767b5ac32f813e1d670501dbd0e6 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jul 24 22:30:27 2019 +0200 patch 8.1.1746: ":dl" is seen as ":dlist" instead of ":delete" Problem: ":dl" is seen as ":dlist" instead of ":delete". Solution: Do not use cmdidxs2[] if the length is 1. (closes https://github.com/vim/vim/issues/4721)

" 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