Prevent session from starting during WordPress pseudo cron procedures

WordPress needs special handling when it comes to starting sessions. See this related issue. CiviCRM Core also tries to start sessions in CRM_Utils_System_Base::sessionStart() but doesn't follow the same logic as the WordPress plugin, and throws similar warnings when it tries to.

Related issue in WordPress.

PR here: https://github.com/civicrm/civicrm-core/pull/17890

Edited Jul 18, 2020 by haystack

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information