diff --git a/7.3.449 b/7.3.449
new file mode 100644
index 0000000..9b5bdea
--- /dev/null
+++ b/7.3.449
@@ -0,0 +1,455 @@
+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.449
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.449
+Problem:    Crash when a BufWinLeave autocommand closes the only other window.
+	    (Daniel Hunt)
+Solution:   Abort closing a buffer when it becomes the only one.
+Files:	    src/buffer.c, src/proto/buffer.pro, src/ex_cmds.c, src/ex_getln.c,
+	    src/misc2.c, src/quickfix.c, src/window.c, src/proto/window.pro
+
+
+*** ../vim-7.3.448/src/buffer.c	2012-01-20 20:44:38.000000000 +0100
+--- src/buffer.c	2012-02-22 14:50:42.000000000 +0100
+***************
+*** 64,69 ****
+--- 64,72 ----
+  static char *msg_loclist = N_("[Location List]");
+  static char *msg_qflist = N_("[Quickfix List]");
+  #endif
++ #ifdef FEAT_AUTOCMD
++ static char *e_auabort = N_("E855: Autocommands caused command to abort");
++ #endif
+  
+  /*
+   * Open current buffer, that is: open the memfile and read the file into
+***************
+*** 96,102 ****
+  	 * There MUST be a memfile, otherwise we can't do anything
+  	 * If we can't create one for the current buffer, take another buffer
+  	 */
+! 	close_buffer(NULL, curbuf, 0);
+  	for (curbuf = firstbuf; curbuf != NULL; curbuf = curbuf->b_next)
+  	    if (curbuf->b_ml.ml_mfp != NULL)
+  		break;
+--- 99,105 ----
+  	 * There MUST be a memfile, otherwise we can't do anything
+  	 * If we can't create one for the current buffer, take another buffer
+  	 */
+! 	close_buffer(NULL, curbuf, 0, FALSE);
+  	for (curbuf = firstbuf; curbuf != NULL; curbuf = curbuf->b_next)
+  	    if (curbuf->b_ml.ml_mfp != NULL)
+  		break;
+***************
+*** 316,327 ****
+   * get a new buffer very soon!
+   *
+   * The 'bufhidden' option can force freeing and deleting.
+   */
+      void
+! close_buffer(win, buf, action)
+      win_T	*win;		/* if not NULL, set b_last_cursor */
+      buf_T	*buf;
+      int		action;
+  {
+  #ifdef FEAT_AUTOCMD
+      int		is_curbuf;
+--- 319,335 ----
+   * get a new buffer very soon!
+   *
+   * The 'bufhidden' option can force freeing and deleting.
++  *
++  * When "abort_if_last" is TRUE then do not close the buffer if autocommands
++  * cause there to be only one window with this buffer.  e.g. when ":quit" is
++  * supposed to close the window but autocommands close all other windows.
+   */
+      void
+! close_buffer(win, buf, action, abort_if_last)
+      win_T	*win;		/* if not NULL, set b_last_cursor */
+      buf_T	*buf;
+      int		action;
++     int		abort_if_last;
+  {
+  #ifdef FEAT_AUTOCMD
+      int		is_curbuf;
+***************
+*** 371,378 ****
+      {
+  	apply_autocmds(EVENT_BUFWINLEAVE, buf->b_fname, buf->b_fname,
+  								  FALSE, buf);
+! 	if (!buf_valid(buf))	    /* autocommands may delete the buffer */
+  	    return;
+  
+  	/* When the buffer becomes hidden, but is not unloaded, trigger
+  	 * BufHidden */
+--- 379,390 ----
+      {
+  	apply_autocmds(EVENT_BUFWINLEAVE, buf->b_fname, buf->b_fname,
+  								  FALSE, buf);
+! 	/* Return if autocommands deleted the buffer or made it the only one. */
+! 	if (!buf_valid(buf) || (abort_if_last && one_window()))
+! 	{
+! 	    EMSG(_(e_auabort));
+  	    return;
++ 	}
+  
+  	/* When the buffer becomes hidden, but is not unloaded, trigger
+  	 * BufHidden */
+***************
+*** 380,387 ****
+  	{
+  	    apply_autocmds(EVENT_BUFHIDDEN, buf->b_fname, buf->b_fname,
+  								  FALSE, buf);
+! 	    if (!buf_valid(buf))	/* autocmds may delete the buffer */
+  		return;
+  	}
+  # ifdef FEAT_EVAL
+  	if (aborting())	    /* autocmds may abort script processing */
+--- 392,404 ----
+  	{
+  	    apply_autocmds(EVENT_BUFHIDDEN, buf->b_fname, buf->b_fname,
+  								  FALSE, buf);
+! 	    /* Return if autocommands deleted the buffer or made it the only
+! 	     * one. */
+! 	    if (!buf_valid(buf) || (abort_if_last && one_window()))
+! 	    {
+! 		EMSG(_(e_auabort));
+  		return;
++ 	    }
+  	}
+  # ifdef FEAT_EVAL
+  	if (aborting())	    /* autocmds may abort script processing */
+***************
+*** 775,781 ****
+  	 * open a new, empty buffer. */
+  	swap_exists_action = SEA_NONE;	/* don't want it again */
+  	swap_exists_did_quit = TRUE;
+! 	close_buffer(curwin, curbuf, DOBUF_UNLOAD);
+  	if (!buf_valid(old_curbuf) || old_curbuf == curbuf)
+  	    old_curbuf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
+  	if (old_curbuf != NULL)
+--- 792,798 ----
+  	 * open a new, empty buffer. */
+  	swap_exists_action = SEA_NONE;	/* don't want it again */
+  	swap_exists_did_quit = TRUE;
+! 	close_buffer(curwin, curbuf, DOBUF_UNLOAD, FALSE);
+  	if (!buf_valid(old_curbuf) || old_curbuf == curbuf)
+  	    old_curbuf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
+  	if (old_curbuf != NULL)
+***************
+*** 1122,1128 ****
+  	     * if the buffer still exists.
+  	     */
+  	    if (buf != curbuf && buf_valid(buf) && buf->b_nwindows == 0)
+! 		close_buffer(NULL, buf, action);
+  	    return retval;
+  	}
+  
+--- 1139,1145 ----
+  	     * if the buffer still exists.
+  	     */
+  	    if (buf != curbuf && buf_valid(buf) && buf->b_nwindows == 0)
+! 		close_buffer(NULL, buf, action, FALSE);
+  	    return retval;
+  	}
+  
+***************
+*** 1146,1152 ****
+  	    close_windows(buf, FALSE);
+  #endif
+  	    if (buf != curbuf && buf_valid(buf) && buf->b_nwindows <= 0)
+! 		close_buffer(NULL, buf, action);
+  	    return OK;
+  	}
+  
+--- 1163,1169 ----
+  	    close_windows(buf, FALSE);
+  #endif
+  	    if (buf != curbuf && buf_valid(buf) && buf->b_nwindows <= 0)
+! 		close_buffer(NULL, buf, action, FALSE);
+  	    return OK;
+  	}
+  
+***************
+*** 1378,1384 ****
+  	    close_buffer(prevbuf == curwin->w_buffer ? curwin : NULL, prevbuf,
+  		    unload ? action : (action == DOBUF_GOTO
+  			&& !P_HID(prevbuf)
+! 			&& !bufIsChanged(prevbuf)) ? DOBUF_UNLOAD : 0);
+  	}
+      }
+  #ifdef FEAT_AUTOCMD
+--- 1395,1401 ----
+  	    close_buffer(prevbuf == curwin->w_buffer ? curwin : NULL, prevbuf,
+  		    unload ? action : (action == DOBUF_GOTO
+  			&& !P_HID(prevbuf)
+! 			&& !bufIsChanged(prevbuf)) ? DOBUF_UNLOAD : 0, FALSE);
+  	}
+      }
+  #ifdef FEAT_AUTOCMD
+***************
+*** 2708,2714 ****
+  		vim_free(ffname);
+  		return FAIL;
+  	    }
+! 	    close_buffer(NULL, obuf, DOBUF_WIPE); /* delete from the list */
+  	}
+  	sfname = vim_strsave(sfname);
+  	if (ffname == NULL || sfname == NULL)
+--- 2725,2732 ----
+  		vim_free(ffname);
+  		return FAIL;
+  	    }
+! 	    /* delete from the list */
+! 	    close_buffer(NULL, obuf, DOBUF_WIPE, FALSE);
+  	}
+  	sfname = vim_strsave(sfname);
+  	if (ffname == NULL || sfname == NULL)
+***************
+*** 5638,5644 ****
+      if (!aucmd)		    /* Don't trigger BufDelete autocommands here. */
+  	block_autocmds();
+  #endif
+!     close_buffer(NULL, buf, DOBUF_WIPE);
+  #ifdef FEAT_AUTOCMD
+      if (!aucmd)
+  	unblock_autocmds();
+--- 5656,5662 ----
+      if (!aucmd)		    /* Don't trigger BufDelete autocommands here. */
+  	block_autocmds();
+  #endif
+!     close_buffer(NULL, buf, DOBUF_WIPE, FALSE);
+  #ifdef FEAT_AUTOCMD
+      if (!aucmd)
+  	unblock_autocmds();
+*** ../vim-7.3.448/src/proto/buffer.pro	2010-08-15 21:57:28.000000000 +0200
+--- src/proto/buffer.pro	2012-02-22 14:04:26.000000000 +0100
+***************
+*** 1,7 ****
+  /* buffer.c */
+  int open_buffer __ARGS((int read_stdin, exarg_T *eap, int flags));
+  int buf_valid __ARGS((buf_T *buf));
+! void close_buffer __ARGS((win_T *win, buf_T *buf, int action));
+  void buf_clear_file __ARGS((buf_T *buf));
+  void buf_freeall __ARGS((buf_T *buf, int flags));
+  void goto_buffer __ARGS((exarg_T *eap, int start, int dir, int count));
+--- 1,7 ----
+  /* buffer.c */
+  int open_buffer __ARGS((int read_stdin, exarg_T *eap, int flags));
+  int buf_valid __ARGS((buf_T *buf));
+! void close_buffer __ARGS((win_T *win, buf_T *buf, int action, int abort_if_last));
+  void buf_clear_file __ARGS((buf_T *buf));
+  void buf_freeall __ARGS((buf_T *buf, int flags));
+  void goto_buffer __ARGS((exarg_T *eap, int start, int dir, int count));
+*** ../vim-7.3.448/src/ex_cmds.c	2011-12-30 15:01:55.000000000 +0100
+--- src/ex_cmds.c	2012-02-22 14:00:32.000000000 +0100
+***************
+*** 3387,3393 ****
+  		/* close the link to the current buffer */
+  		u_sync(FALSE);
+  		close_buffer(oldwin, curbuf,
+! 				      (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD);
+  
+  #ifdef FEAT_AUTOCMD
+  		/* Autocommands may open a new window and leave oldwin open
+--- 3387,3393 ----
+  		/* close the link to the current buffer */
+  		u_sync(FALSE);
+  		close_buffer(oldwin, curbuf,
+! 			       (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD, FALSE);
+  
+  #ifdef FEAT_AUTOCMD
+  		/* Autocommands may open a new window and leave oldwin open
+*** ../vim-7.3.448/src/ex_getln.c	2012-02-04 22:44:27.000000000 +0100
+--- src/ex_getln.c	2012-02-22 14:01:56.000000000 +0100
+***************
+*** 6443,6449 ****
+  	/* win_close() may have already wiped the buffer when 'bh' is
+  	 * set to 'wipe' */
+  	if (buf_valid(bp))
+! 	    close_buffer(NULL, bp, DOBUF_WIPE);
+  
+  	/* Restore window sizes. */
+  	win_size_restore(&winsizes);
+--- 6443,6449 ----
+  	/* win_close() may have already wiped the buffer when 'bh' is
+  	 * set to 'wipe' */
+  	if (buf_valid(bp))
+! 	    close_buffer(NULL, bp, DOBUF_WIPE, FALSE);
+  
+  	/* Restore window sizes. */
+  	win_size_restore(&winsizes);
+*** ../vim-7.3.448/src/misc2.c	2012-02-20 22:18:22.000000000 +0100
+--- src/misc2.c	2012-02-22 14:02:12.000000000 +0100
+***************
+*** 1173,1179 ****
+      for (buf = firstbuf; buf != NULL; )
+      {
+  	nextbuf = buf->b_next;
+! 	close_buffer(NULL, buf, DOBUF_WIPE);
+  	if (buf_valid(buf))
+  	    buf = nextbuf;	/* didn't work, try next one */
+  	else
+--- 1173,1179 ----
+      for (buf = firstbuf; buf != NULL; )
+      {
+  	nextbuf = buf->b_next;
+! 	close_buffer(NULL, buf, DOBUF_WIPE, FALSE);
+  	if (buf_valid(buf))
+  	    buf = nextbuf;	/* didn't work, try next one */
+  	else
+*** ../vim-7.3.448/src/quickfix.c	2012-01-20 13:39:03.000000000 +0100
+--- src/quickfix.c	2012-02-22 14:02:20.000000000 +0100
+***************
+*** 3565,3571 ****
+      buf_T	*buf;
+  {
+      if (curbuf != buf)		/* safety check */
+! 	close_buffer(NULL, buf, DOBUF_UNLOAD);
+  }
+  
+  #if defined(FEAT_EVAL) || defined(PROTO)
+--- 3565,3571 ----
+      buf_T	*buf;
+  {
+      if (curbuf != buf)		/* safety check */
+! 	close_buffer(NULL, buf, DOBUF_UNLOAD, FALSE);
+  }
+  
+  #if defined(FEAT_EVAL) || defined(PROTO)
+*** ../vim-7.3.448/src/window.c	2012-01-10 22:26:12.000000000 +0100
+--- src/window.c	2012-02-22 14:08:13.000000000 +0100
+***************
+*** 23,29 ****
+  static void win_totop __ARGS((int size, int flags));
+  static void win_equal_rec __ARGS((win_T *next_curwin, int current, frame_T *topfr, int dir, int col, int row, int width, int height));
+  static int last_window __ARGS((void));
+- static int one_window __ARGS((void));
+  static win_T *win_free_mem __ARGS((win_T *win, int *dirp, tabpage_T *tp));
+  static frame_T *win_altframe __ARGS((win_T *win, tabpage_T *tp));
+  static tabpage_T *alt_tabpage __ARGS((void));
+--- 23,28 ----
+***************
+*** 2083,2089 ****
+   * Return TRUE if there is only one window other than "aucmd_win" in the
+   * current tab page.
+   */
+!     static int
+  one_window()
+  {
+  #ifdef FEAT_AUTOCMD
+--- 2082,2088 ----
+   * Return TRUE if there is only one window other than "aucmd_win" in the
+   * current tab page.
+   */
+!     int
+  one_window()
+  {
+  #ifdef FEAT_AUTOCMD
+***************
+*** 2109,2115 ****
+   * Close window "win".  Only works for the current tab page.
+   * If "free_buf" is TRUE related buffer may be unloaded.
+   *
+!  * called by :quit, :close, :xit, :wq and findtag()
+   */
+      void
+  win_close(win, free_buf)
+--- 2108,2114 ----
+   * Close window "win".  Only works for the current tab page.
+   * If "free_buf" is TRUE related buffer may be unloaded.
+   *
+!  * Called by :quit, :close, :xit, :wq and findtag().
+   */
+      void
+  win_close(win, free_buf)
+***************
+*** 2222,2228 ****
+       * Close the link to the buffer.
+       */
+      if (win->w_buffer != NULL)
+! 	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0);
+  
+      /* Autocommands may have closed the window already, or closed the only
+       * other window or moved to another tab page. */
+--- 2221,2227 ----
+       * Close the link to the buffer.
+       */
+      if (win->w_buffer != NULL)
+! 	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, TRUE);
+  
+      /* Autocommands may have closed the window already, or closed the only
+       * other window or moved to another tab page. */
+***************
+*** 2328,2334 ****
+      int		free_tp = FALSE;
+  
+      /* Close the link to the buffer. */
+!     close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0);
+  
+      /* Careful: Autocommands may have closed the tab page or made it the
+       * current tab page.  */
+--- 2327,2333 ----
+      int		free_tp = FALSE;
+  
+      /* Close the link to the buffer. */
+!     close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, FALSE);
+  
+      /* Careful: Autocommands may have closed the tab page or made it the
+       * current tab page.  */
+*** ../vim-7.3.448/src/proto/window.pro	2010-08-15 21:57:28.000000000 +0200
+--- src/proto/window.pro	2012-02-22 14:08:28.000000000 +0100
+***************
+*** 1,13 ****
+  /* window.c */
+  void do_window __ARGS((int nchar, long Prenum, int xchar));
+  int win_split __ARGS((int size, int flags));
+! int win_split_ins __ARGS((int size, int flags, win_T *newwin, int dir));
+  int win_valid __ARGS((win_T *win));
+  int win_count __ARGS((void));
+  int make_windows __ARGS((int count, int vertical));
+  void win_move_after __ARGS((win_T *win1, win_T *win2));
+  void win_equal __ARGS((win_T *next_curwin, int current, int dir));
+  void close_windows __ARGS((buf_T *buf, int keep_curwin));
+  void win_close __ARGS((win_T *win, int free_buf));
+  void win_close_othertab __ARGS((win_T *win, int free_buf, tabpage_T *tp));
+  void win_free_all __ARGS((void));
+--- 1,14 ----
+  /* window.c */
+  void do_window __ARGS((int nchar, long Prenum, int xchar));
+  int win_split __ARGS((int size, int flags));
+! int win_split_ins __ARGS((int size, int flags, win_T *new_wp, int dir));
+  int win_valid __ARGS((win_T *win));
+  int win_count __ARGS((void));
+  int make_windows __ARGS((int count, int vertical));
+  void win_move_after __ARGS((win_T *win1, win_T *win2));
+  void win_equal __ARGS((win_T *next_curwin, int current, int dir));
+  void close_windows __ARGS((buf_T *buf, int keep_curwin));
++ int one_window __ARGS((void));
+  void win_close __ARGS((win_T *win, int free_buf));
+  void win_close_othertab __ARGS((win_T *win, int free_buf, tabpage_T *tp));
+  void win_free_all __ARGS((void));
+*** ../vim-7.3.448/src/version.c	2012-02-22 13:07:02.000000000 +0100
+--- src/version.c	2012-02-22 14:55:21.000000000 +0100
+***************
+*** 716,717 ****
+--- 716,719 ----
+  {   /* Add new patch number below this line */
++ /**/
++     449,
+  /**/
+
+-- 
+From "know your smileys":
+ :-)-O	Smiling doctor with stethoscope
+
+ /// 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    ///