patch 8.0.1831: sometimes the quickfix title is incorrectly prefixed with ':' commit https://github.com/vim/vim/commit/8b62e31003693fee4b288e7aea49170f032aeef3 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 13 15:29:04 2018 +0200 patch 8.0.1831: sometimes the quickfix title is incorrectly prefixed with ':' Problem: Sometimes the quickfix title is incorrectly prefixed with ':'. Solution: Prepend the colon in another way. (Yegappan Lakshmanan, closes #2905)

" Test 'autochdir' behavior

if !exists("+autochdir")
  finish
endif

func Test_set_filename()
  let cwd = getcwd()
  call test_autochdir()
  set acd
  new
  w samples/Xtest
  call assert_equal("Xtest", expand('%'))
  call assert_equal("samples", substitute(getcwd(), '.*/\(\k*\)', '\1', ''))
  bwipe!
  set noacd
  exe 'cd ' . cwd
  call delete('samples/Xtest')
endfunc