Theme_Upgrader::delete_old_theme( bool $removed, string $local_destination, string $remote_destination, array $theme ): bool

757	public function delete_old_theme( $removed, $local_destination, $remote_destination, $theme ) {758		global $wp_filesystem;759 760		if ( is_wp_error( $removed ) ) {761			return $removed; // Pass errors through.762		}763 764		if ( ! isset( $theme['theme'] ) ) {765			return $removed;766		}767 768		$theme      = $theme['theme'];769		$themes_dir = trailingslashit( $wp_filesystem->wp_themes_dir( $theme ) );770		if ( $wp_filesystem->exists( $themes_dir . $theme ) ) {771			if ( ! $wp_filesystem->delete( $themes_dir . $theme, true ) ) {772				return false;773			}774		}775 776		return true;777	}