Patch 9.0.0389
Problem:    Crash when 'tagfunc' closes the window.
Solution:   Bail out when the window was closed.
Files:      src/errors.h, src/tag.c, src/testdir/test_tagfunc.vim


*** ../vim-9.0.0388/src/errors.h        2022-09-01 12:22:19.743659145 +0100
--- src/errors.h        2022-09-05 19:26:23.610398721 +0100
***************
*** 3324,3326 ****
--- 3324,3328 ----
  EXTERN char e_non_null_list_required_for_argument_nr[]
        INIT(= N_("E1298: Non-NULL List required for argument %d"));
  #endif
+ EXTERN char e_window_unexpectedly_close_while_searching_for_tags[]
+       INIT(= N_("E1299: Window unexpectedly closed while searching for 
tags"));
*** ../vim-9.0.0388/src/tag.c   2022-09-03 12:59:15.326103296 +0100
--- src/tag.c   2022-09-05 19:45:15.793045793 +0100
***************
*** 690,695 ****
--- 690,705 ----
                max_num_matches = MAXCOL; // If less than max_num_matches
                                          // found: all matches found.
  
+           // A tag function may do anything, which may cause various
+           // information to become invalid.  At least check for the tagstack
+           // to still be the same.
+           if (tagstack != curwin->w_tagstack)
+           {
+               emsg(_(e_window_unexpectedly_close_while_searching_for_tags));
+               FreeWild(new_num_matches, new_matches);
+               break;
+           }
+ 
            // If there already were some matches for the same name, move them
            // to the start.  Avoids that the order changes when using
            // ":tnext" and jumping to another file.
*** ../vim-9.0.0388/src/testdir/test_tagfunc.vim        2022-08-22 
16:35:41.698700428 +0100
--- src/testdir/test_tagfunc.vim        2022-09-05 19:49:12.877306146 +0100
***************
*** 401,404 ****
--- 401,417 ----
    set tagfunc=
  endfunc
  
+ func Test_tagfunc_closes_window()
+   split any
+   func MytagfuncClose(pat, flags, info)
+     close
+     return [{'name' : 'mytag', 'filename' : 'Xtest', 'cmd' : '1'}]
+   endfunc
+   set tagfunc=MytagfuncClose
+   call assert_fails('tag xyz', 'E1299:')
+ 
+   set tagfunc=
+ endfunc
+ 
+ 
  " vim: shiftwidth=2 sts=2 expandtab
*** ../vim-9.0.0388/src/version.c       2022-09-05 18:27:38.847160366 +0100
--- src/version.c       2022-09-05 19:26:12.074422359 +0100
***************
*** 705,706 ****
--- 705,708 ----
  {   /* Add new patch number below this line */
+ /**/
+     389,
  /**/

-- 
hundred-and-one symptoms of being an internet addict:
8. You spend half of the plane trip with your laptop on your lap...and your
   child in the overhead compartment.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///                                                                      \\\
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