Meeting response instance ID is not passed to backend

[mschering]

Describe the bug
In this line the instanceid is taken from the request:

Z-Push/src/lib/request/meetingresponse.php

Line 65 in 446e046

$req["instanceid"] = self::$decoder->getElementContent();

But it's never passed to the backend:

Z-Push/src/lib/request/meetingresponse.php

Line 97 in 446e046

$calendarid = self::$backend->MeetingResponse($req["requestid"], $backendFolderId, $req["response"]);

Making it impossible to handle a response for an instance of a recurring instance.

To Reproduce
Approve an instance and the whole series is updated.

Expected behavior
Only the instance should be updated

Logs

Server (please complete the following information):

• OS: iOS
• PHP Version: 8.2
• Backend for: Group-Office
• and Version: 2.7.3

[matidau]

@mschering thanks for raising this, it might be a breaking change so I'll need to leave this for another version and mark it as an "Enhancement" even though it is a bug so I can keep track if it.