Ticket #34252: 34252.patch

src/wp-login.php

@@ -341 +341 @@
          * Filter the subject of the password reset email.
          *
          * @since 2.8.0
+         * @since 4.4 Added `$user_login` and `$user_data` parameters.
          *
-         * @param string $title Default email title.
+         * @param string  $title      Default email title.
+         * @param string  $user_login The username for the user.
+         * @param WP_User $user_data  WP_User object.
          */
-        $title = apply_filters( 'retrieve_password_title', $title );
+        $title = apply_filters( 'retrieve_password_title', $title, $user_login, $user_data );
 
         /**
          * Filter the message body of the password reset mail.