vim-patch:7.4.320

Problem:    Possible crash when an BufLeave autocommand deletes the buffer.
Solution:   Check for the window pointer being valid.  Postpone freeing the
            window until autocommands are done. (Yasuhiro Matsumoto)

https://code.google.com/p/vim/source/detail?r=v7-4-320

src/nvim/version.c

@@ -308,7 +308,7 @@ static int included_patches[] = {
   323,
   //322 NA
   //321 NA
-  //320,
+  320,
   //319 NA
   318,
   317,