Search: Parse playlists when searching a channel (#3804)

src/invidious/yt_backend/extractors.cr

@@ -381,7 +381,7 @@ private module Parsers
   # Parses an InnerTube itemSectionRenderer into a SearchVideo.
   # Returns nil when the given object isn't a ItemSectionRenderer
   #
-  # A itemSectionRenderer seems to be a simple wrapper for a videoRenderer, used
+  # A itemSectionRenderer seems to be a simple wrapper for a videoRenderer or a playlistRenderer, used
   # by the result page for channel searches. It is located inside a continuationItems
   # container.It is very similar to RichItemRendererParser
   #
@@ -394,6 +394,8 @@ private module Parsers
 
     private def self.parse(item_contents, author_fallback)
       child = VideoRendererParser.process(item_contents, author_fallback)
+      child ||= PlaylistRendererParser.process(item_contents, author_fallback)
+
       return child
     end