commit https://github.com/vim/vim/commit/4f416e41243ca151b95d39d81ce23d00b1484755 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 16 16:08:18 2016 +0200 patch 7.4.2217 Problem: When using matchaddpos() a character after the end of the line can be highlighted. Solution: Only highlight existing characters. (Hirohito Higashi)

" Test 'autochdir' behavior

if !exists("+autochdir")
  finish
endif

func Test_set_filename()
  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
  call delete('samples/Xtest')
endfunc