Contact could not be saved if both birthday and date of birth given

[skjnldsv]

Ref: nextcloud/contacts#507

Steps to reproduce

1. Create a new contact
2. Add birthday
3. Add anniversary

---

1. Edit an existing contact that has a birthday
2. Add anniversary

Expected behaviour

Save contact.

Actual behaviour

Error message: "Contact could not be saved."

Browser log

"Calendar object with uid already exists in this calendar collection."

Sabre\DAV\Exception\BadRequest: Calendar object with uid already exists in this calendar collection.
/var/www/html/apps/dav/lib/CalDAV/BirthdayService.php - line 308: OCA\DAV\CalDAV\CalDavBackend->createCalendarObject('11', 'kontakte-91a46d...', 'BEGIN VCALENDAR...')
/var/www/html/apps/dav/lib/CalDAV/BirthdayService.php - line 99: OCA\DAV\CalDAV\BirthdayService->updateCalendar('91a46d63-24f2-4...', 'BEGIN VCARD\r\nVE...', Array, '11', Array)
/var/www/html/apps/dav/lib/AppInfo/Application.php - line 119: OCA\DAV\CalDAV\BirthdayService->onCardChanged('2', '91a46d63-24f2-4...', 'BEGIN VCARD\r\nVE...')[internal function] OCA\DAV\AppInfo\Application->OCA\DAV\AppInfo{closure}(*** sensitive parameters replaced ***)
/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 212: call_user_func(Object(Closure), Object(Symfony\Component\EventDispatcher\GenericEvent), '\OCA\DAV\CardDA...', Object(Symfony\Component\EventDispatcher\EventDispatcher))
/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php - line 44: Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, '\OCA\DAV\CardDA...', Object(Symfony\Component\EventDispatcher\GenericEvent))
/var/www/html/apps/dav/lib/CardDAV/CardDavBackend.php - line 683: Symfony\Component\EventDispatcher\EventDispatcher->dispatch('\OCA\DAV\CardDA...', Object(Symfony\Component\EventDispatcher\GenericEvent))
/var/www/html/3rdparty/sabre/dav/lib/CardDAV/Card.php - line 96: OCA\DAV\CardDAV\CardDavBackend->updateCard('2', '91a46d63-24f2-4...', 'BEGIN VCARD\r\nVE...')
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 1130: Sabre\CardDAV\Card->put('BEGIN VCARD\r\nVE...')
/var/www/html/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 513: Sabre\DAV\Server->updateFile('addressbooks/us...', 'BEGIN VCARD\r\nVE...', NULL)[internal function] Sabre\DAV\CorePlugin->httpPut(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/html/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit('method PUT', Array)
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/var/www/html/apps/dav/lib/Server.php - line 283: Sabre\DAV\Server->exec()/var/www/html/apps/dav/appinfo/v2/remote.php - line 35: OCA\DAV\Server->exec()
/var/www/html/remote.php - line 164: require_once('/var/www/html/a...'){main}

[nextcloud-bot]

GitMate.io thinks possibly related issues are #8629 (Birthday Calendar: Update on contact save fails if more than one date field is used), #3084 (contact birthdays with no year given are shown with (*1604) in calendar), #1585 (Reminders for "Contact Birthdays"?), #4592 (Contacts menu should mention if a user has birthday), and #410 (Birthday calendar not generated for shared contacts).

[skjnldsv]

Duplicate of #8629