function bp_do_register_theme_directory() {
	// If bp-default exists in another theme directory, bail.
	// This ensures that the version of bp-default in the regular themes
	// directory will always take precedence, as part of a migration away
	// from the version packaged with BuddyPress.
	foreach ( array_values( (array) $GLOBALS['wp_theme_directories'] ) as $directory ) {
		if ( is_dir( $directory . '/bp-default' ) ) {
			return false;
		}
	}

	// If the current theme is bp-default (or a bp-default child), BP
	// should register its directory.
	$register = 'bp-default' === get_stylesheet() || 'bp-default' === get_template();

	// Legacy sites continue to have the theme registered.
	if ( empty( $register ) && ( 1 == get_site_option( '_bp_retain_bp_default' ) ) ) {
		$register = true;
	}

	/**
	 * Filters whether BuddyPress should register the bp-themes directory.
	 *
	 * @since 1.9.0
	 *
	 * @param bool $register If bp-themes should be registered.
	 */
	return apply_filters( 'bp_do_register_theme_directory', $register );
}