bp_get_activity_comment_css_class()

	function bp_get_activity_comment_css_class() {

		$class = ' comment-item';

		// Fall back on current comment in activity loop.
		$comment_depth = bp_activity_get_comment_depth();

		// Threading is turned on, so check the depth.
		if ( get_option( 'thread_comments' ) ) {
			$class .= (bool) ( $comment_depth > get_option( 'thread_comments_depth' ) ) ? ' detached-comment-item' : '';
		}

		return apply_filters( 'bp_get_activity_comment_css_class',  $class );
	}