wp-includes/class-wp-customize-manager.php:3358Checks locked changeset with heartbeat API.
$responsearray$dataarray$screen_idstringarray public function check_changeset_lock_with_heartbeat( $response, $data, $screen_id ) { if ( isset( $data['changeset_uuid'] ) ) { $changeset_post_id = $this->find_changeset_post_id( $data['changeset_uuid'] ); } else { $changeset_post_id = $this->changeset_post_id(); } if ( array_key_exists( 'check_changeset_lock', $data ) && 'customize' === $screen_id && $changeset_post_id && current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id ) ) { $lock_user_id = wp_check_post_lock( $changeset_post_id ); if ( $lock_user_id ) { $response['customize_changeset_lock_user'] = $this->get_lock_user_data( $lock_user_id ); } else { // Refreshing time will ensure that the user is sitting on customizer and has not closed the customizer tab. $this->refresh_changeset_lock( $changeset_post_id ); } } return $response; }Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-manager.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.