BP_Groups_Component::setup_canonical_stack()

	public function setup_canonical_stack() {
		if ( ! bp_is_groups_component() ) {
			return;
		}

		if ( empty( $this->current_group ) ) {
			return;
		}

		$customizer_option = 'group_default_tab';
		$default_tab       = '';

		if ( function_exists( 'bp_nouveau_get_temporary_setting' ) && function_exists( 'bp_nouveau_get_appearance_settings' ) ) {
			$default_tab = bp_nouveau_get_temporary_setting( $customizer_option,bp_nouveau_get_appearance_settings( $customizer_option ) );
		}
		$default_tab = bp_is_active( $default_tab ) ? $default_tab : 'members';

		/**
		 * Filters the default groups extension.
		 *
		 * @since BuddyPress 1.6.0
		 *
		 * @param string $value BP_GROUPS_DEFAULT_EXTENSION constant if defined,
		 *                      else 'members'.
		 */
		$this->default_extension = apply_filters( 'bp_groups_default_extension', defined( 'BP_GROUPS_DEFAULT_EXTENSION' ) ? BP_GROUPS_DEFAULT_EXTENSION : ( '' === $default_tab ) ? 'members' : $default_tab );

		$bp = buddypress();

		$user_has_access = $this->current_group->user_has_access;
		$is_visible      = $this->current_group->is_visible;

		if ( ! $user_has_access && $is_visible ) {
			$bp->current_action = 'request-membership';
		}

		// members are displayed in the front nav.
		if ( bp_is_current_action( 'home' ) || ! bp_current_action() ) {
			$bp->current_action = $this->default_extension;
		}

		// Prepare for a redirect to the canonical URL.
		$bp->canonical_stack['base_url'] = bp_get_group_permalink( $this->current_group );

		if ( bp_current_action() ) {
			$bp->canonical_stack['action'] = bp_current_action();
		}

		if ( ! empty( $bp->action_variables ) ) {
			$bp->canonical_stack['action_variables'] = bp_action_variables();
		}

		// When viewing the default extension, the canonical URL should not have
		// that extension's slug, unless more has been tacked onto the URL via
		// action variables.
		if ( bp_is_current_action( $this->default_extension ) && empty( $bp->action_variables ) )  {
			unset( $bp->canonical_stack['action'] );
		}
	}