fix(eval): check for v:lua when calling callback (#19855)

This makes callback_call() match call_vim_function() when calling a function.

2 files changed, 12 insertions, 2 deletions

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 21068e9101..f2fe106224 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -5842,7 +5842,17 @@ bool callback_call(Callback *const callback, const int argcount_in, typval_T *co
   switch (callback->type) {
   case kCallbackFuncref:
     name = callback->data.funcref;
-    partial = NULL;
+    int len = (int)STRLEN(name);
+    if (len >= 6 && !memcmp(name, "v:lua.", 6)) {
+      name += 6;
+      len = check_luafunc_name(name, false);
+      if (len == 0) {
+        return false;
+      }
+      partial = vvlua_partial;
+    } else {
+      partial = NULL;
+    }
     break;
 
   case kCallbackPartial:
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index b4fc7534bc..50f9650a8a 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -6191,7 +6191,7 @@ static void op_function(const oparg_T *oap)
     finish_op = false;
 
     typval_T rettv;
-    if (callback_call(&opfunc_cb, 1, argv, &rettv) != FAIL) {
+    if (callback_call(&opfunc_cb, 1, argv, &rettv)) {
       tv_clear(&rettv);
     }