Attach original_update to all events

telethon/events/common.py

@@ -97,6 +97,7 @@ class EventCommon(abc.ABC):
         self._chat = None
 
         self.pattern_match = None
+        self.original_update = None
 
         self.is_private = isinstance(chat_peer, types.PeerUser)
         self.is_group = (

telethon/telegram_client.py

@@ -2323,6 +2323,7 @@ class TelegramClient(TelegramBareClient):
             event = builder.build(update)
             if event:
                 event._client = self
+                event.original_update = update
                 try:
                     callback(event)
                 except events.StopPropagation: