Add mark_chat_unread() method

[ColinShark]

Title says all. Mark a chat as unread.

https://t.me/PyrogramChat/123932

[JosXa]

Please also add a convenience method to user_and_chats/chat.py

[delivrance]

@ColinTheShark Can you confirm this works without the need of an InputDialogPeer object?
If that works, it means the server accepts either types (as it happens in a bunch of other places) and thus I think we can accept the method having chat instead of dialog in its name for convenience.

[delivrance]

Also, what about marking a chat as read instead? The raw method allows to do that too, but the issue here is the misleading name.

[ColinShark]

Can you confirm this works without the need of an InputDialogPeer object?

I haven't explicitly tested against an InputDialogPeer object but I can confirm that my snippet ^{(same raw method)} works both in private- and group chats.

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Please also add a convenience method to user_and_chats/chat.py

You mean a bound method, right? If so, I added that already :)

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Also, what about marking a chat as read instead?

While read_history can mark up to a specific point (or the latest message if no max_id is given), MarkDialogUnread just marks as unread. I have tried with unread=False as an argument, which didn't remove the unread status. I'm sure there is a raw method to mark a chat as read without using read_history, but I believe Clients just use the raw equivalent to read_history.

[delivrance]

When we add a new method we usually name it like app.action_on_type, when it's a bound method we remove "type" because it's redundant (bad: chat.mark_chat_unread, good: chat.mark_unread).