coopsymbiotic/wordpress/wp-civicrm-mailer#1 avoid creating duplicate contact in CiviCRM

civicrm_mailer.http.class.php

@@ -41,6 +41,21 @@ class CivicrmMailerHTTPMailer extends \PHPMailer
       if ($user && $user->ID) {
         $uf_id = $user->ID;
       }
+      else {
+        // special case of email change request
+        // check if a _new_email correspond in wp_usermeta
+        $args = [
+          'fields' => 'user_id',
+          'meta_key' => '_new_email',
+          'meta_value' => $recipient,
+          'meta_compare' => 'LIKE',
+        ];
+        $q = new \WP_User_Query($args);
+        $res = $q->get_results();
+
+        // if we have only one result, assume it's the user we need
+        if (count($res) == 1 && isset($res[0])) $uf_id = $res[0];
+      }
 
       if ($uf_id) {
         try {