Incoming messages were read
updateReadHistoryInbox#9c974fdf flags:# folder_id:flags.0?int peer:Peer max_id:int still_unread_count:int pts:int pts_count:int = Update;
|Flags, see TL conditional fields
|Peer folder ID, for more info click here
|Maximum ID of messages read
|Number of messages that are still unread
|Event count after generation
|Number of events that were generated
Telegram allows placing chats into folders, based on their type, mute status, or other custom criteria, thanks to folder blacklists and whitelists.
How to subscribe to updates and handle them properly.