fixup! FIX louietan#76: handle both old and new function signatures of `request--curl-callback'

Check for the new 3-arg arity. By default, expect the stable, 2-arg arity from
'request.el'

Author: Sodel-the-Vociferous

anki-editor.el

@@ -166,14 +166,14 @@ See https://apps.ankiweb.net/docs/manual.html#latex-conflicts.")
       ;; why here we manually invoke callbacks to receive the result.
       (unless (request-response-done-p response)
         ;; (request--curl-callback "localhost" (get-buffer-process (request-response--buffer response)) "finished\n")))
-        (if (equalp '(2 . 2) (func-arity 'request--curl-callback))
-            ;; Handle the older, stable version of 'request.el' in which
-            ;; `request--curl-callback' has two args.
-            (request--curl-callback (get-buffer-process (request-response--buffer response)) "finished\n")
-          ;; Handle new 3-argument function signature as of 'request.el' commit
-          ;; '8ccbae1b5e5e2ae68112dd46a6bee67d318b0deb'. Should fix anki-editor
-          ;; errors for those using newer versions of 'request.el'.
-          (request--curl-callback url (get-buffer-process (request-response--buffer response)) "finished\n"))))
+        (if (equalp '(3 . 3) (func-arity 'request--curl-callback))
+            ;; Handle new 3-argument function signature as of 'request.el' commit
+            ;; '8ccbae1b5e5e2ae68112dd46a6bee67d318b0deb'. Should fix anki-editor
+            ;; errors for those using newer versions of 'request.el'.
+            (request--curl-callback url (get-buffer-process (request-response--buffer response)) "finished\n")
+          ;; Handle the older, stable version of 'request.el' in which
+          ;; `request--curl-callback' has two args.
+          (request--curl-callback (get-buffer-process (request-response--buffer response)) "finished\n"))))
 
     (when err (error "Error communicating with AnkiConnect using cURL: %s" err))
     (or reply (error "Got empty reply from AnkiConnect"))))