diff --git a/7.3.173 b/7.3.173
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+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.173
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.173
+Problem:    After using setqflist() to make the quickfix list empty ":cwindow"
+	    may open the window anyway.  Also after ":vimgrep".
+Solution:   Correctly check whether the list is empty. (Ingo Karkat)
+Files:	    src/quickfix.c
+
+
+*** ../vim-7.3.172/src/quickfix.c	2011-04-28 17:27:05.000000000 +0200
+--- src/quickfix.c	2011-05-05 16:55:47.000000000 +0200
+***************
+*** 1164,1170 ****
+  
+  	/* When no valid entries are present in the list, qf_ptr points to
+  	 * the first item in the list */
+! 	if (to_qfl->qf_nonevalid == TRUE)
+  	    to_qfl->qf_ptr = to_qfl->qf_start;
+      }
+  
+--- 1164,1170 ----
+  
+  	/* When no valid entries are present in the list, qf_ptr points to
+  	 * the first item in the list */
+! 	if (to_qfl->qf_nonevalid)
+  	    to_qfl->qf_ptr = to_qfl->qf_start;
+      }
+  
+***************
+*** 2243,2248 ****
+--- 2243,2249 ----
+       * it if we have errors; otherwise, leave it closed.
+       */
+      if (qi->qf_lists[qi->qf_curlist].qf_nonevalid
++ 	    || qi->qf_lists[qi->qf_curlist].qf_count == 0
+  	    || qi->qf_curlist >= qi->qf_listcount)
+      {
+  	if (win != NULL)
+***************
+*** 3711,3717 ****
+      }
+  
+      if (qi->qf_lists[qi->qf_curlist].qf_index == 0)
+! 	/* empty list or no valid entry */
+  	qi->qf_lists[qi->qf_curlist].qf_nonevalid = TRUE;
+      else
+  	qi->qf_lists[qi->qf_curlist].qf_nonevalid = FALSE;
+--- 3712,3718 ----
+      }
+  
+      if (qi->qf_lists[qi->qf_curlist].qf_index == 0)
+! 	/* no valid entry */
+  	qi->qf_lists[qi->qf_curlist].qf_nonevalid = TRUE;
+      else
+  	qi->qf_lists[qi->qf_curlist].qf_nonevalid = FALSE;
+*** ../vim-7.3.172/src/version.c	2011-05-05 16:41:19.000000000 +0200
+--- src/version.c	2011-05-05 17:11:57.000000000 +0200
+***************
+*** 716,717 ****
+--- 716,719 ----
+  {   /* Add new patch number below this line */
++ /**/
++     173,
+  /**/
+
+-- 
+"I can't complain, but sometimes I still do."   (Joe Walsh)
+
+ /// 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    ///