Make use of AlbumHack for all albums

Closes #3916.

The new MessageBox system is not designed with "albums come in the
same updates container" in mind (in fact, there was a note about this).

This version was also not intended to be published to PyPi, but it is,
so a workaround must be made for events.Album to remain working.

In essence, AlbumHack will always be used even if it technically did not
need to be used previously. This will cause a small delay for those
updates, but it should not be a major issue.

telethon/client/updates.py

@@ -260,6 +260,7 @@ class UpdateMethods:
                         await self._dispatch_update(updates_to_dispatch.popleft())
                     else:
                         while updates_to_dispatch:
+                            # TODO if _dispatch_update fails for whatever reason, it's not logged! this should be fixed
                             task = self.loop.create_task(self._dispatch_update(updates_to_dispatch.popleft()))
                             self._event_handler_tasks.add(task)
                             task.add_done_callback(lambda _: self._event_handler_tasks.discard(task))

telethon/events/album.py

@@ -97,8 +97,10 @@ class Album(EventBuilder):
 
     @classmethod
     def build(cls, update, others=None, self_id=None):
-        if not others:
-            return  # We only care about albums which come inside the same Updates
+        # TODO normally we'd only check updates if they come with other updates
+        # but MessageBox is not designed for this so others will always be None.
+        # In essence we always rely on AlbumHack rather than returning early if not others.
+        others = [update]
 
         if isinstance(update,
                       (types.UpdateNewMessage, types.UpdateNewChannelMessage)):