commit https://github.com/vim/vim/commit/5c71994f4ee5f87d4cce990dbc9684c70b1e108b Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jul 9 23:40:45 2016 +0200 patch 7.4.2015 Problem: When a file gets a name when writing it 'acd' is not effective. (Dan Church) Solution: Invoke DO_AUTOCHDIR after writing the file. (Allen Haim, closes #777, closes #803) Add test_autochdir() to enable 'acd' before "starting" is reset.

--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1635,7 +1635,7 @@ enter_buffer(buf_T *buf)
     void
 do_autochdir(void)
 {
-    if (starting == 0
+    if ((starting == 0 || test_autochdir)
 	    && curbuf->b_ffname != NULL
 	    && vim_chdirfile(curbuf->b_ffname) == OK)
 	shorten_fnames(TRUE);