src/admin/class-papi-admin-entry-post.php
public function redirect_post_location( $location ) {
		if ( ! isset( $_SERVER['HTTP_REFERER'] ) ) {
			return $location;
		}

		$referer = $_SERVER['HTTP_REFERER'];
		$referer = strtolower( $referer );

		if ( strpos( $referer, 'papi-iframe-mode' ) === false ) {
			return $location;
		}

		return sprintf( '%s&papi_css[]=papi-iframe-mode', $location );
	}
public function redirect_post_location( $location ) {
		if ( ! isset( $_SERVER['HTTP_REFERER'] ) ) {
			return $location;
		}

		$referer = $_SERVER['HTTP_REFERER'];
		$referer = strtolower( $referer );

		if ( strpos( $referer, 'papi-iframe-mode' ) === false ) {
			return $location;
		}

		return sprintf( '%s&papi_css[]=papi-iframe-mode', $location );
	}
Redirect post location when post is in iframe mode.

@param  string $location

@return string