artichokelucy on "function convert_to_screen() no longer exists in template.php?"

Well, hmmm. I appear to have fixed it. I put

require_once(ABSPATH . 'wp-admin/includes/template.php' );

if( ! class_exists('WP_Screen') ) {
require_once( ABSPATH . 'wp-admin/includes/screen.php' );
}

into wp-list-table.php and then

global $hook_suffix;

in screen.php's get() function

Is this something that should maybe be fixed on Wordpress' end?