Patch 7.3.197
Problem:    When a QuickfixCmdPost event removes all errors, Vim still tries
            to jump to the first error, resulting in E42.
Solution:   Get the number of error after the autocmd event. (Mike Lundy)
Files:      src/quickfix.c


*** ../mercurial/vim73/src/quickfix.c   2011-05-10 16:41:13.000000000 +0200
--- src/quickfix.c      2011-05-19 17:34:11.000000000 +0200
***************
*** 2813,2829 ****
                                           (eap->cmdidx != CMD_grepadd
                                            && eap->cmdidx != CMD_lgrepadd),
                                           *eap->cmdlinep);
  #ifdef FEAT_AUTOCMD
      if (au_name != NULL)
        apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
                                               curbuf->b_fname, TRUE, curbuf);
  #endif
      if (res > 0 && !eap->forceit)
-     {
-       if (wp != NULL)
-           qi = GET_LOC_LIST(wp);
        qf_jump(qi, 0, 0, FALSE);               /* display first error */
-     }
  
      mch_remove(fname);
      vim_free(fname);
--- 2813,2833 ----
                                           (eap->cmdidx != CMD_grepadd
                                            && eap->cmdidx != CMD_lgrepadd),
                                           *eap->cmdlinep);
+     if (wp != NULL)
+       qi = GET_LOC_LIST(wp);
  #ifdef FEAT_AUTOCMD
      if (au_name != NULL)
+     {
        apply_autocmds(EVENT_QUICKFIXCMDPOST, au_name,
                                               curbuf->b_fname, TRUE, curbuf);
+       if (qi->qf_curlist < qi->qf_listcount)
+           res = qi->qf_lists[qi->qf_curlist].qf_count;
+       else
+           res = 0;
+     }
  #endif
      if (res > 0 && !eap->forceit)
        qf_jump(qi, 0, 0, FALSE);               /* display first error */
  
      mch_remove(fname);
      vim_free(fname);
*** ../vim-7.3.196/src/version.c        2011-05-19 17:25:36.000000000 +0200
--- src/version.c       2011-05-19 17:41:50.000000000 +0200
***************
*** 711,712 ****
--- 711,714 ----
  {   /* Add new patch number below this line */
+ /**/
+     197,
  /**/

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