Trending: fix mistakes from #3773

src/invidious/trending.cr

@@ -20,6 +20,20 @@ def fetch_trending(trending_type, region, locale)
 
   items, _ = extract_items(initial_data)
 
-  # Return items, but ignore categories (e.g featured content)
-  return items.reject!(Category), plid
+  extracted = [] of SearchItem
+
+  items.each do |itm|
+    if itm.is_a?(Category)
+      # Ignore the smaller categories, as they generally contain a sponsored
+      # channel, which brings a lot of noise on the trending page.
+      # See: https://github.com/iv-org/invidious/issues/2989
+      next if itm.contents.size < 24
+
+      extracted.concat extract_category(itm)
+    else
+      extracted << itm
+    end
+  end
+
+  return extracted, plid
 end