fix: $user->getEmailIdentity() returns null after saving new user

Now UserModel does not alter the passed User object state when saving,
but if it is insertion, add the user id to it.

Author: kenjis

src/Models/UserModel.php

@@ -225,12 +225,18 @@ public function activate(User $user): void
      */
     public function insert($data = null, bool $returnID = true)
     {
-        $this->tempUser = $data instanceof User ? $data : null;
+        // Clone User object for not changing the passed object.
+        $this->tempUser = $data instanceof User ? clone $data : null;
 
         $result = parent::insert($data, $returnID);
 
         $this->checkQueryReturn($result);
 
+        // Set user id to the passed User object.
+        if ($data instanceof User) {
+            $data->id = $this->insertID;
+        }
+
         return $returnID ? $this->insertID : $result;
     }
 
@@ -245,7 +251,8 @@ public function insert($data = null, bool $returnID = true)
      */
     public function update($id = null, $data = null): bool
     {
-        $this->tempUser = $data instanceof User ? $data : null;
+        // Clone User object for not changing the passed object.
+        $this->tempUser = $data instanceof User ? clone $data : null;
 
         try {
             /** @throws DataException */