API: return non-generic VimL errors

- Return VimL errors instead of generic errors for:
  - nvim_call_function
  - nvim_call_dict_function
- Fix tests which were silently broken before this change.

This violates #6150 where we agreed not to translate API errors.  But
that can be fixed later.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/nvim/message.c b/src/nvim/message.c
index 7ca82c2878..bcfff90d7d 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -67,6 +67,7 @@ static char_u   *confirm_msg_tail;              /* tail of confirm_msg */
 
 MessageHistoryEntry *first_msg_hist = NULL;
 MessageHistoryEntry *last_msg_hist = NULL;
+char *msg_first_ignored_err = NULL;
 static int msg_hist_len = 0;
 
 static FILE *verbose_fd = NULL;
@@ -504,6 +505,9 @@ int emsg(const char_u *s_)
     if (cause_errthrow((char_u *)s, severe, &ignore) == true) {
       if (!ignore) {
         did_emsg = true;
+        if (msg_first_ignored_err == NULL) {
+          msg_first_ignored_err = xstrdup(s);
+        }
       }
       return true;
     }