diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-admin/includes/comment.php
--- a/wp/wp-admin/includes/comment.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-admin/includes/comment.php	Tue Dec 15 13:49:49 2020 +0100
@@ -21,8 +21,7 @@
  * @param string $comment_author Author of the comment.
  * @param string $comment_date   Date of the comment.
  * @param string $timezone       Timezone. Accepts 'blog' or 'gmt'. Default 'blog'.
- *
- * @return mixed Comment post ID on success.
+ * @return string|null Comment post ID on success.
  */
 function comment_exists( $comment_author, $comment_date, $timezone = 'blog' ) {
 	global $wpdb;
@@ -46,6 +45,10 @@
  * Update a comment with values provided in $_POST.
  *
  * @since 2.0.0
+ * @since 5.5.0 A return value was added.
+ *
+ * @return int|WP_Error The value 1 if the comment was updated, 0 if not updated.
+ *                      A WP_Error object on failure.
  */
 function edit_comment() {
 	if ( ! current_user_can( 'edit_comment', (int) $_POST['comment_ID'] ) ) {
@@ -79,20 +82,21 @@
 	}
 
 	if ( ! empty( $_POST['edit_date'] ) ) {
-		$aa                    = $_POST['aa'];
-		$mm                    = $_POST['mm'];
-		$jj                    = $_POST['jj'];
-		$hh                    = $_POST['hh'];
-		$mn                    = $_POST['mn'];
-		$ss                    = $_POST['ss'];
-		$jj                    = ( $jj > 31 ) ? 31 : $jj;
-		$hh                    = ( $hh > 23 ) ? $hh - 24 : $hh;
-		$mn                    = ( $mn > 59 ) ? $mn - 60 : $mn;
-		$ss                    = ( $ss > 59 ) ? $ss - 60 : $ss;
+		$aa = $_POST['aa'];
+		$mm = $_POST['mm'];
+		$jj = $_POST['jj'];
+		$hh = $_POST['hh'];
+		$mn = $_POST['mn'];
+		$ss = $_POST['ss'];
+		$jj = ( $jj > 31 ) ? 31 : $jj;
+		$hh = ( $hh > 23 ) ? $hh - 24 : $hh;
+		$mn = ( $mn > 59 ) ? $mn - 60 : $mn;
+		$ss = ( $ss > 59 ) ? $ss - 60 : $ss;
+
 		$_POST['comment_date'] = "$aa-$mm-$jj $hh:$mn:$ss";
 	}
 
-	wp_update_comment( $_POST );
+	return wp_update_comment( $_POST, true );
 }
 
 /**
@@ -104,7 +108,8 @@
  * @return WP_Comment|false Comment if found. False on failure.
  */
 function get_comment_to_edit( $id ) {
-	if ( ! $comment = get_comment( $id ) ) {
+	$comment = get_comment( $id );
+	if ( ! $comment ) {
 		return false;
 	}
 
@@ -117,7 +122,7 @@
 	 *
 	 * @since 2.0.0
 	 *
-	 * @param string $comment->comment_content Comment content.
+	 * @param string $comment_content Comment content.
 	 */
 	$comment->comment_content = apply_filters( 'comment_edit_pre', $comment->comment_content );
 
@@ -164,7 +169,7 @@
 
 	$pending_keyed = array();
 
-	// Default to zero pending for all posts in request
+	// Default to zero pending for all posts in request.
 	foreach ( $post_id_array as $id ) {
 		$pending_keyed[ $id ] = 0;
 	}
@@ -179,12 +184,12 @@
 }
 
 /**
- * Add avatars to relevant places in admin, or try to.
+ * Adds avatars to relevant places in admin.
  *
  * @since 2.5.0
  *
  * @param string $name User name.
- * @return string Avatar with Admin name.
+ * @return string Avatar with the user name.
  */
 function floated_admin_avatar( $name ) {
 	$avatar = get_avatar( get_comment(), 32, 'mystery' );
@@ -195,7 +200,7 @@
  * @since 2.7.0
  */
 function enqueue_comment_hotkeys_js() {
-	if ( 'true' == get_user_option( 'comment_shortcuts' ) ) {
+	if ( 'true' === get_user_option( 'comment_shortcuts' ) ) {
 		wp_enqueue_script( 'jquery-table-hotkeys' );
 	}
 }
@@ -207,6 +212,6 @@
  */
 function comment_footer_die( $msg ) {
 	echo "<div class='wrap'><p>$msg</p></div>";
-	include( ABSPATH . 'wp-admin/admin-footer.php' );
+	require_once ABSPATH . 'wp-admin/admin-footer.php';
 	die;
 }