TYPO3 Core

// If previewing a page in a workspace, check if the page is a version overlay of an existing page

// If yes, we want to preview the original page and not the overlay (TYPO3 takes care of proper overlaying)

if (t3lib_extMgm::isLoaded('version') && !empty($GLOBALS['BE_USER']->workspace)) {

$record = self::getRecord('pages', $id);

if (!empty($record['t3ver_oid'])) {

$id = $record['t3ver_oid'];

}

}