Outgoing comments in a discussion thread were marked as read
updateReadChannelDiscussionOutbox#4638a26c channel_id:int top_msg_id:int read_max_id:int = Update;
|top_msg_id||int||ID of the group message that started the thread|
|read_max_id||int||Message ID of latest read outgoing message for this thread|
How to handle channels, supergroups, groups, and what's the difference between them.