bug #33239 [Ldap] Make LdapUser implement EquatableInterface (chalasr)

This PR was merged into the 4.4 branch.

Discussion
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[Ldap] Make LdapUser implement EquatableInterface

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Bugfix because it is required for password migrations https://github.com/symfony/symfony/blob/4.4/src/Symfony/Component/Ldap/Security/LdapUserProvider.php#L128

Commits
-------

ae25509 [Ldap] Make LdapUser implement EquatableInterface

src/Symfony/Component/Ldap/Security/LdapUser.php

@@ -12,14 +12,15 @@
 namespace Symfony\Component\Ldap\Security;
 
 use Symfony\Component\Ldap\Entry;
+use Symfony\Component\Security\Core\User\EquatableInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
 
 /**
  * @author Robin Chalas <robin.chalas@gmail.com>
  *
  * @final
  */
-class LdapUser implements UserInterface
+class LdapUser implements UserInterface, EquatableInterface
 {
     private $entry;
     private $username;
@@ -88,4 +89,28 @@ public function getExtraFields(): array
     {
         return $this->extraFields;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isEqualTo(UserInterface $user): bool
+    {
+        if (!$user instanceof self) {
+            return false;
+        }
+
+        if ($this->getPassword() !== $user->getPassword()) {
+            return false;
+        }
+
+        if ($this->getSalt() !== $user->getSalt()) {
+            return false;
+        }
+
+        if ($this->getUsername() !== $user->getUsername()) {
+            return false;
+        }
+
+        return true;
+    }
 }