Prevent "add_action" from being called multiple times

It came to my attention that CRM_Utils_System_WordPress::addHTMLHead() can potentially add multiple callbacks to wp_head and/or admin_head because $registered is never set. PR to follow.

added git:civicrm-wordpress sig:bug triaged labels

PR here: https://github.com/civicrm/civicrm-core/pull/19061

changed milestone to %5.34.0

PR has been merged closing

closed