Fix for ticket #1131. If the rss feed is for an item, then retrieve the item. Using the left and right pointers find all the comments for the child items. Thanks to jankoprowski for the initial investigation.

modules/comment/helpers/comment_rss.php

@@ -33,13 +33,20 @@ class comment_rss_Core {
       return;
     }
 
+    Kohana_Log::add("error", "feed($feed_id, $offset, $limit, $id)");
     $comments = ORM::factory("comment")
       ->viewable()
       ->where("state", "=", "published")
       ->order_by("created", "DESC");
 
     if ($feed_id == "item") {
-      $comments->where("item_id", "=", $id);
+      $item = ORM::factory("item", $id);
+      $subquery = db::select("id")
+        ->from("items")
+        ->where("left_ptr", ">=", $item->left_ptr)
+        ->where("right_ptr", "<=", $item->right_ptr);
+      $comments
+        ->where("item_id", "in", $subquery);
     }
 
     $feed = new stdClass();