WP_Terms_List_Table::__construct

	public function __construct( $args = array() ) {
		global $post_type, $taxonomy, $action, $tax;

		parent::__construct(
			array(
				'plural'   => 'tags',
				'singular' => 'tag',
				'screen'   => isset( $args['screen'] ) ? $args['screen'] : null,
			)
		);

		$action    = $this->screen->action;
		$post_type = $this->screen->post_type;
		$taxonomy  = $this->screen->taxonomy;

		if ( empty( $taxonomy ) ) {
			$taxonomy = 'post_tag';
		}

		if ( ! taxonomy_exists( $taxonomy ) ) {
			wp_die( __( 'Invalid taxonomy.' ) );
		}

		$tax = get_taxonomy( $taxonomy );

		// @todo Still needed? Maybe just the show_ui part.
		if ( empty( $post_type ) || ! in_array( $post_type, get_post_types( array( 'show_ui' => true ) ), true ) ) {
			$post_type = 'post';
		}

	}