perf(ldap): Optimize check if LDAP user is deleted

Check first if the current user is deleted, before loading all the
deleted users and checking if their deletion is still up-to-date.

Allow to abort early for non-deleted users.

Signed-off-by: Carl Schwan <carlschwan@kde.org>

Author: CarlSchwan

lib/Service/LdapService.php

@@ -48,6 +48,10 @@ public function isLdapDeletedUser(IUser $user): bool {
 			return false;
 		}
 
+		if (!$dui->isUserMarked($user->getUID())) {
+			return false;
+		}
+
 		if (!$dui->hasUsers()) {
 			return false;
 		}

tests/stubs/oca_user_ldap.php

@@ -26,6 +26,8 @@ public function hasUsers(): bool {
 	public function getUsers(): array {
 		return [];
 	}
+
+	public function isUserMarked(string $uid): bool {}
 }
 
 namespace OCA\User_LDAP;