commit https://github.com/vim/vim/commit/dda933d06c06c2792bd686d059f6ad19191ad30b Author: Bram Moolenaar <Bram@vim.org> Date: Sat Sep 3 21:04:58 2016 +0200 patch 7.4.2320 Problem: Redraw problem when using 'incsearch'. Solution: Save the current view when deleting characters. (Christian Brabandt) Fix that the '" mark is set in the wrong position. Don't change the search start when using BS.

" 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