To: vim_dev@googlegroups.com
Subject: Patch 7.4.645
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

Patch 7.4.645
Problem:    When splitting the window in a BufAdd autocommand while still in
	    the first, empty buffer the window count is wrong.
Solution:   Do not reset b_nwindows to zero and don't increment it.
Files:	    src/buffer.c, src/ex_cmds.c


*** ../vim-7.4.644/src/buffer.c	2015-01-27 18:43:42.134535513 +0100
--- src/buffer.c	2015-02-27 19:33:51.325459521 +0100
***************
*** 1794,1800 ****
  	if (aborting())		/* autocmds may abort script processing */
  	    return NULL;
  #endif
- 	/* buf->b_nwindows = 0; why was this here? */
  	free_buffer_stuff(buf, FALSE);	/* delete local variables et al. */
  
  	/* Init the options. */
--- 1794,1799 ----
***************
*** 1872,1877 ****
--- 1871,1879 ----
  #ifdef FEAT_AUTOCMD
      if (!(flags & BLN_DUMMY))
      {
+ 	/* Tricky: these autocommands may change the buffer list.  They could
+ 	 * also split the window with re-using the one empty buffer. This may
+ 	 * result in unexpectedly losing the empty buffer. */
  	apply_autocmds(EVENT_BUFNEW, NULL, NULL, FALSE, buf);
  	if (!buf_valid(buf))
  	    return NULL;
*** ../vim-7.4.644/src/ex_cmds.c	2015-02-17 12:17:10.837775002 +0100
--- src/ex_cmds.c	2015-02-27 19:28:47.232909242 +0100
***************
*** 3375,3381 ****
  	if (buf->b_ml.ml_mfp == NULL)		/* no memfile yet */
  	{
  	    oldbuf = FALSE;
- 	    buf->b_nwindows = 0;
  	}
  	else					/* existing memfile */
  	{
--- 3375,3380 ----
***************
*** 3408,3414 ****
  	 * Make the (new) buffer the one used by the current window.
  	 * If the old buffer becomes unused, free it if ECMD_HIDE is FALSE.
  	 * If the current buffer was empty and has no file name, curbuf
! 	 * is returned by buflist_new().
  	 */
  	if (buf != curbuf)
  	{
--- 3407,3413 ----
  	 * Make the (new) buffer the one used by the current window.
  	 * If the old buffer becomes unused, free it if ECMD_HIDE is FALSE.
  	 * If the current buffer was empty and has no file name, curbuf
! 	 * is returned by buflist_new(), nothing to do here.
  	 */
  	if (buf != curbuf)
  	{
***************
*** 3515,3522 ****
  	    au_new_curbuf = NULL;
  #endif
  	}
- 	else
- 	    ++curbuf->b_nwindows;
  
  	curwin->w_pcmark.lnum = 1;
  	curwin->w_pcmark.col = 0;
--- 3514,3519 ----
*** ../vim-7.4.644/src/version.c	2015-02-27 18:25:10.820179062 +0100
--- src/version.c	2015-02-27 19:33:06.153971911 +0100
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     645,
  /**/

-- 
       He was not in the least bit scared to be mashed into a pulp
       Or to have his eyes gouged out and his elbows broken;
       To have his kneecaps split and his body burned away
       And his limbs all hacked and mangled, brave Sir Robin.
                 "Monty Python and the Holy Grail" PYTHON (MONTY) PICTURES LTD

 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///