bp_blogs_update_post_activity_meta( WP_Post $post, BP_Activity_Activity $activity, object $activity_post_object )

function bp_blogs_update_post_activity_meta( $post, $activity, $activity_post_object ) {
	if ( empty( $activity->id ) || empty( $activity_post_object->action_id ) ) {
		return;
	}

	// Update post title in activity meta.
	$existing_title = bp_activity_get_meta( $activity->id, 'post_title' );
	if ( $post->post_title !== $existing_title ) {
		bp_activity_update_meta( $activity->id, 'post_title', $post->post_title );

		if ( ! empty( $activity_post_object->comments_tracking->action_id ) ) {
			// Now update activity meta for post comments... sigh.
			add_filter( 'comments_clauses', 'bp_blogs_comments_clauses_select_by_id' );
			$comments = get_comments( array( 'post_id' => $post->ID ) );
			remove_filter( 'comments_clauses', 'bp_blogs_comments_clauses_select_by_id' );

			if ( ! empty( $comments ) ) {
				$activity_ids = array();
				$comment_ids  = wp_list_pluck( $comments, 'comment_ID' );

				// Set up activity args.
				$args = array(
					'update_meta_cache' => false,
					'show_hidden'       => true,
					'per_page'          => 99999,
				);

				// Query for old-style "new_blog_comment" activity items.
				$args['filter'] = array(
					'object'       => $activity_post_object->comments_tracking->component_id,
					'action'       => $activity_post_object->comments_tracking->action_id,
					'primary_id'   => get_current_blog_id(),
					'secondary_id' => implode( ',', $comment_ids ),
				);

				$activities = bp_activity_get( $args );
				if ( ! empty( $activities['activities'] ) ) {
					$activity_ids = (array) wp_list_pluck( $activities['activities'], 'id' );
				}

				// Query for activity comments connected to a blog post.
				unset( $args['filter'] );
				$args['meta_query'] = array( array(
					'key'     => 'bp_blogs_' . $post->post_type . '_comment_id',
					'value'   => $comment_ids,
					'compare' => 'IN',
				) );
				$args['type'] = 'activity_comment';
				$args['display_comments'] = 'stream';

				$activities = bp_activity_get( $args );
				if ( ! empty( $activities['activities'] ) ) {
					$activity_ids = array_merge( $activity_ids, (array) wp_list_pluck( $activities['activities'], 'id' ) );
				}

				// Update activity meta for all found activity items.
				if ( ! empty( $activity_ids ) ) {
					foreach ( $activity_ids as $aid ) {
						bp_activity_update_meta( $aid, 'post_title', $post->post_title );
					}
				}

				unset( $activities, $activity_ids, $comment_ids, $comments );
			}
		}
	}

	// Add post comment status to activity meta if closed.
	if( 'closed' == $post->comment_status ) {
		bp_activity_update_meta( $activity->id, 'post_comment_status', $post->comment_status );
	} else {
		bp_activity_delete_meta( $activity->id, 'post_comment_status' );
	}
}