vim-patch:8.2.2430: :vimgrep expands wildcards twice (#13853)

Problem:    :vimgrep expands wildcards twice.
Solution:   Do not expand wildcards a second time.
f8c6a17180

src/nvim/ex_cmds2.c

@@ -1639,10 +1639,10 @@ int get_arglist_exp(char_u *str, int *fcountp, char_u ***fnamesp, bool wig)
 
   if (wig) {
     i = expand_wildcards(ga.ga_len, (char_u **)ga.ga_data,
-                         fcountp, fnamesp, EW_FILE|EW_NOTFOUND);
+                         fcountp, fnamesp, EW_FILE|EW_NOTFOUND|EW_NOTWILD);
   } else {
     i = gen_expand_wildcards(ga.ga_len, (char_u **)ga.ga_data,
-                             fcountp, fnamesp, EW_FILE|EW_NOTFOUND);
+                             fcountp, fnamesp, EW_FILE|EW_NOTFOUND|EW_NOTWILD);
   }
 
   ga_clear(&ga);

src/nvim/quickfix.c

@@ -5264,7 +5264,7 @@ void ex_vimgrep(exarg_T *eap)
     qf_new_list(qi, title);
   }
 
-  // parse the list of arguments
+  // Parse the list of arguments, wildcards have already been expanded.
   if (get_arglist_exp(p, &fcount, &fnames, true) == FAIL) {
     goto theend;
   }

src/nvim/testdir/test_quickfix.vim

@@ -2650,6 +2650,13 @@ func Test_vimgrep()
   call XvimgrepTests('l')
 endfunc
 
+func Test_vimgrep_wildcards_expanded_once()
+  new X[id-01] file.txt
+  call setline(1, 'some text to search for')
+  vimgrep text %
+  bwipe!
+endfunc
+
 " Test for incsearch highlighting of the :vimgrep pattern
 " This test used to cause "E315: ml_get: invalid lnum" errors.
 func Test_vimgrep_incsearch()