wp-includes/class-wp-customize-manager.php:973Prevents Ajax requests from following redirects when previewing a theme by issuing a 200 response instead of a 30x.
$statusintint public function wp_redirect_status( $status ) { _deprecated_function( __FUNCTION__, '4.7.0' ); if ( $this->is_preview() && ! is_admin() ) { return 200; } return $status; }Introduced in 3.4.0. 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.