Deprecation: #70316 - Frontend basket with recs

See Issue #70316

Description

The TypoScriptFrontendController has a basic mechanism to automatically register session data if the GET/POST variable recs is given. This has been deprecated. This additionally obsoletes the configuration variable $GLOBALS['TYPO3_CONF_VARS']['FE']['maxSessionDataSize'] which has been deprecated, too.

Impact

Handling baskets or other session data in recs throws a deprecation warning.

Affected Installations

Extensions with a legacy that rely on this automatic basket (tt_products for example) should be adapted. Searching extensions for string recs should reveal affected parts.

Migration

Use the session functions setKey() and getKey() of $GLOBALS['TSFE']->fe_user directly to store session data like basket information from within the extension.