Merge pull request #39770 from nextcloud/fix/always-use-displayname-f…

…rom-correct-backend

fix: always use display name from correct backend

lib/private/Accounts/AccountManager.php

@@ -62,6 +62,7 @@
 use OCP\Mail\IMailer;
 use OCP\Security\ICrypto;
 use OCP\Security\VerificationToken\IVerificationToken;
+use OCP\User\Backend\IGetDisplayNameBackend;
 use OCP\Util;
 use Psr\Log\LoggerInterface;
 use function array_flip;
@@ -744,6 +745,10 @@ public function getAccount(IUser $user): IAccount {
 			return $cached;
 		}
 		$account = $this->parseAccountData($user, $this->getUser($user));
+		if ($user->getBackend() instanceof IGetDisplayNameBackend) {
+			$property = $account->getProperty(self::PROPERTY_DISPLAYNAME);
+			$account->setProperty(self::PROPERTY_DISPLAYNAME, $user->getDisplayName(), $property->getScope(), $property->getVerified());
+		}
 		$this->internalCache->set($user->getUID(), $account);
 		return $account;
 	}