Mail: Add missing embeds key for the wp_mail_succeeded action's $mail_data param.

Follow-up to [60698].

Props iflairwebtechnologies, SirLouen, johnbillion.
See #28059.
Fixes #64348.


git-svn-id: https://develop.svn.wordpress.org/trunk@61352 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/pluggable.php

@@ -618,7 +618,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 		 */
 		do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );
 
-		$mail_data = compact( 'to', 'subject', 'message', 'headers', 'attachments' );
+		$mail_data = compact( 'to', 'subject', 'message', 'headers', 'attachments', 'embeds' );
 
 		// Send!
 		try {

tests/phpunit/tests/pluggable/wpMail.php

@@ -446,6 +446,7 @@ public function test_phpmailer_exception_thrown() {
 			'message'                  => 'Test Message',
 			'headers'                  => array(),
 			'attachments'              => array(),
+			'embeds'                   => array(),
 			'phpmailer_exception_code' => 2,
 		);