patch 8.0.0274: possible recursive screen updating causes trouble commit https://github.com/vim/vim/commit/070b33da93ad3a191664bb61f5ccc50781460c03 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 31 21:53:39 2017 +0100 patch 8.0.0274: possible recursive screen updating causes trouble Problem: When update_single_line() is called recursively, or another screen update happens while it is busy, errors may occur. Solution: Check and update updating_screen. (Christian Brabandt)

" Tests for the :set command

function Test_set_backslash()
  let isk_save = &isk

  set isk=a,b,c
  set isk+=d
  call assert_equal('a,b,c,d', &isk)
  set isk+=\\,e
  call assert_equal('a,b,c,d,\,e', &isk)
  set isk-=e
  call assert_equal('a,b,c,d,\', &isk)
  set isk-=\\
  call assert_equal('a,b,c,d', &isk)

  let &isk = isk_save
endfunction

function Test_set_add()
  let wig_save = &wig

  set wildignore=*.png,
  set wildignore+=*.jpg
  call assert_equal('*.png,*.jpg', &wig)

  let &wig = wig_save
endfunction