patch 8.2.3690: Vim9: "filter #pat# cmd" does not work

Problem:    Vim9: "filter #pat# cmd" does not work.
Solution:   Do not see #pat# as a comment.

src/ex_docmd.c

@@ -2910,7 +2910,14 @@ parse_command_modifiers(
 			    int	    c = 0;
 
 			    if (!checkforcmd_noparen(&p, "filter", 4)
-						|| *p == NUL || ends_excmd(*p))
+				    || *p == NUL
+				    || (ends_excmd(*p)
+#ifdef FEAT_EVAL
+					// in ":filter #pat# cmd" # does not
+					// start a comment
+				     && (!in_vim9script() || VIM_ISWHITE(p[1]))
+#endif
+				     ))
 				break;
 			    if (*p == '!')
 			    {

src/testdir/test_vim9_cmd.vim

@@ -714,6 +714,16 @@ def Test_command_modifier_filter()
       assert_match('very specific z3d37dh234 string', Screenline(&lines))
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      edit foobar
+      redir => g:filter_out
+      filter #foobar# ls
+      redir END
+      assert_match('"foobar"', g:filter_out)
+      unlet g:filter_out
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_win_command_modifiers()

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3690,
 /**/
     3689,
 /**/