diff -r 490d5cc509ed -r cf61fcea0001 wp/wp-includes/widgets/class-wp-widget-recent-comments.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/widgets/class-wp-widget-recent-comments.php	Mon Oct 14 17:39:30 2019 +0200
@@ -0,0 +1,174 @@
+<?php
+/**
+ * Widget API: WP_Widget_Recent_Comments class
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used to implement a Recent Comments widget.
+ *
+ * @since 2.8.0
+ *
+ * @see WP_Widget
+ */
+class WP_Widget_Recent_Comments extends WP_Widget {
+
+	/**
+	 * Sets up a new Recent Comments widget instance.
+	 *
+	 * @since 2.8.0
+	 */
+	public function __construct() {
+		$widget_ops = array(
+			'classname' => 'widget_recent_comments',
+			'description' => __( 'Your site&#8217;s most recent comments.' ),
+			'customize_selective_refresh' => true,
+		);
+		parent::__construct( 'recent-comments', __( 'Recent Comments' ), $widget_ops );
+		$this->alt_option_name = 'widget_recent_comments';
+
+		if ( is_active_widget( false, false, $this->id_base ) || is_customize_preview() ) {
+			add_action( 'wp_head', array( $this, 'recent_comments_style' ) );
+		}
+	}
+
+ 	/**
+	 * Outputs the default styles for the Recent Comments widget.
+	 *
+	 * @since 2.8.0
+	 */
+	public function recent_comments_style() {
+		/**
+		 * Filters the Recent Comments default widget styles.
+		 *
+		 * @since 3.1.0
+		 *
+		 * @param bool   $active  Whether the widget is active. Default true.
+		 * @param string $id_base The widget ID.
+		 */
+		if ( ! current_theme_supports( 'widgets' ) // Temp hack #14876
+			|| ! apply_filters( 'show_recent_comments_widget_style', true, $this->id_base ) )
+			return;
+		?>
+		<style type="text/css">.recentcomments a{display:inline !important;padding:0 !important;margin:0 !important;}</style>
+		<?php
+	}
+
+	/**
+	 * Outputs the content for the current Recent Comments widget instance.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param array $args     Display arguments including 'before_title', 'after_title',
+	 *                        'before_widget', and 'after_widget'.
+	 * @param array $instance Settings for the current Recent Comments widget instance.
+	 */
+	public function widget( $args, $instance ) {
+		if ( ! isset( $args['widget_id'] ) )
+			$args['widget_id'] = $this->id;
+
+		$output = '';
+
+		$title = ( ! empty( $instance['title'] ) ) ? $instance['title'] : __( 'Recent Comments' );
+
+		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
+		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
+
+		$number = ( ! empty( $instance['number'] ) ) ? absint( $instance['number'] ) : 5;
+		if ( ! $number )
+			$number = 5;
+
+		/**
+		 * Filters the arguments for the Recent Comments widget.
+		 *
+		 * @since 3.4.0
+		 * @since 4.9.0 Added the `$instance` parameter.
+		 *
+		 * @see WP_Comment_Query::query() for information on accepted arguments.
+		 *
+		 * @param array $comment_args An array of arguments used to retrieve the recent comments.
+		 * @param array $instance     Array of settings for the current widget.
+		 */
+		$comments = get_comments( apply_filters( 'widget_comments_args', array(
+			'number'      => $number,
+			'status'      => 'approve',
+			'post_status' => 'publish'
+		), $instance ) );
+
+		$output .= $args['before_widget'];
+		if ( $title ) {
+			$output .= $args['before_title'] . $title . $args['after_title'];
+		}
+
+		$output .= '<ul id="recentcomments">';
+		if ( is_array( $comments ) && $comments ) {
+			// Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
+			$post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
+			_prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );
+
+			foreach ( (array) $comments as $comment ) {
+				$output .= '<li class="recentcomments">';
+				/* translators: comments widget: 1: comment author, 2: post link */
+				$output .= sprintf( _x( '%1$s on %2$s', 'widgets' ),
+					'<span class="comment-author-link">' . get_comment_author_link( $comment ) . '</span>',
+					'<a href="' . esc_url( get_comment_link( $comment ) ) . '">' . get_the_title( $comment->comment_post_ID ) . '</a>'
+				);
+				$output .= '</li>';
+			}
+		}
+		$output .= '</ul>';
+		$output .= $args['after_widget'];
+
+		echo $output;
+	}
+
+	/**
+	 * Handles updating settings for the current Recent Comments widget instance.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param array $new_instance New settings for this instance as input by the user via
+	 *                            WP_Widget::form().
+	 * @param array $old_instance Old settings for this instance.
+	 * @return array Updated settings to save.
+	 */
+	public function update( $new_instance, $old_instance ) {
+		$instance = $old_instance;
+		$instance['title'] = sanitize_text_field( $new_instance['title'] );
+		$instance['number'] = absint( $new_instance['number'] );
+		return $instance;
+	}
+
+	/**
+	 * Outputs the settings form for the Recent Comments widget.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param array $instance Current settings.
+	 */
+	public function form( $instance ) {
+		$title = isset( $instance['title'] ) ? $instance['title'] : '';
+		$number = isset( $instance['number'] ) ? absint( $instance['number'] ) : 5;
+		?>
+		<p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>
+		<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>
+
+		<p><label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e( 'Number of comments to show:' ); ?></label>
+		<input class="tiny-text" id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" type="number" step="1" min="1" value="<?php echo $number; ?>" size="3" /></p>
+		<?php
+	}
+
+	/**
+	 * Flushes the Recent Comments widget cache.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @deprecated 4.4.0 Fragment caching was removed in favor of split queries.
+	 */
+	public function flush_widget_cache() {
+		_deprecated_function( __METHOD__, '4.4.0' );
+	}
+}