Contentsliding is not stopping at sysfolder since TYPO3 v10 - How to solve? - typo3

Question

The TSref entry for slide explains:
Up to Version 9 of TYPO3 the sliding stopped when reaching a folder.
Beginning with TYPO3 10 this is not longer the case. See
$cObj->checkPid_badDoktypeList.
Ok, this variable is still 255 (formerly directly, now via constant PageRepository::DOKTYPE_RECYCLER).
What exactly should I see there that will help me? Or better, how to get content sliding still working like before?

Answer 1

You have to extend the ContentObjectRenderer class and overwrite the getSlidePids method with your own extension.
In the boot function of ext_localconf.php:
$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::class] = [
'className' => \YourVendor\YourExtensionKey\ContentObject\ContentObjectRenderer::class
];
Then you have to create your own "Classes/ContentObject/ContentObjectRenderer.php" with:
<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace YourVendor\YourExtension\ContentObject;
use TYPO3\CMS\Core\Domain\Repository\PageRepository;
use TYPO3\CMS\Core\Utility\GeneralUtility;
class ContentObjectRenderer extends \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer
{
/**
* Returns all parents of the given PID (Page UID) list
*
* #param string $pidList A list of page Content-Element PIDs (Page UIDs) / stdWrap
* #param array $pidConf stdWrap array for the list
* #return string A list of PIDs
* #internal
*/
public function getSlidePids($pidList, $pidConf)
{
// todo: phpstan states that $pidConf always exists and is not nullable. At the moment, this is a false positive
// as null can be passed into this method via $pidConf. As soon as more strict types are used, this isset
// check must be replaced with a more appropriate check like empty or count.
$pidList = isset($pidConf) ? trim($this->stdWrap($pidList, $pidConf)) : trim($pidList);
if ($pidList === '') {
$pidList = 'this';
}
$tsfe = $this->getTypoScriptFrontendController();
$listArr = null;
if (trim($pidList)) {
$listArr = GeneralUtility::intExplode(',', str_replace('this', (string)$tsfe->contentPid, $pidList));
$listArr = $this->checkPidArray($listArr);
}
$pidList = [];
if (is_array($listArr) && !empty($listArr)) {
foreach ($listArr as $uid) {
$page = $tsfe->sys_page->getPage($uid);
if($page['doktype'] == PageRepository::DOKTYPE_SYSFOLDER)
break;
if (!$page['is_siteroot']) {
$pidList[] = $page['pid'];
}
}
}
return implode(',', $pidList);
}
}