vim-patch:9.0.2030: no max callback recursion limit (#25655)

Problem:  no max callback recursion limit
Solution: bail out, if max call recursion for callback functions
          has been reached.

This checks the 'maxfuncdepth' setting and throws E169 when a callback
function recursively calls itself.

closes: vim/vim#13337
closes: vim/vim#13339

47510f3d65

Co-authored-by: Christian Brabandt <cb@256bit.org>

src/nvim/eval.c

@@ -6064,6 +6064,11 @@ bool callback_call(Callback *const callback, const int argcount_in, typval_T *co
                    typval_T *const rettv)
   FUNC_ATTR_NONNULL_ALL
 {
+  if (callback_depth > p_mfd) {
+    emsg(_(e_command_too_recursive));
+    return false;
+  }
+
   partial_T *partial;
   char *name;
   Array args = ARRAY_DICT_INIT;

src/nvim/options.lua

@@ -5154,6 +5154,7 @@ return {
         Increasing this limit above 200 also changes the maximum for Ex
         command recursion, see |E169|.
         See also |:function|.
+        Also used for maximum depth of callback functions.
       ]=],
       full_name = 'maxfuncdepth',
       scope = { 'global' },