Ticket #33631: 33631.patch

src/wp-admin/network/site-new.php

@@ -90 +90 @@
         $password = 'N/A';
         $user_id = email_exists($email);
         if ( !$user_id ) { // Create a new user with a random password
+                /**
+                 * Fires when a new user will be created via the network site-new.php page.
+                 *
+                 * @since 4.5.0
+                 *
+                 * @param string $email Email of the non-existent user.
+                 */
+                do_action( 'network_site_new_created_user_pending', $email );
+
                 $user_id = username_exists( $domain );
                 if ( $user_id ) {
                         wp_die( __( 'The domain or path entered conflicts with an existing username.' ) );