Added the ability to make blockquote expandable.

[EgorKhabarov]

Description

Include changes, new features and etc:
Added the ability to make blockquote expandable.

Describe your tests

How did you test your change?

bot.parse_mode = "HTML"
bot.send_message(chat_id, hcite("123"*123))
bot.send_message(chat_id, hcite("123"*123, expandable=True))
bot.parse_mode = "MarkdownV2"
bot.send_message(chat_id, mcite("123"*123))
bot.send_message(chat_id, mcite("123"*123, expandable=True))

Python version:

OS:

Checklist:

• I added/edited example on new feature/change (if exists)
• My changes won't break backward compatibility
• I made changes both for sync and async

[Badiboy]

LGTM.

@coder2020official ?

[coder2020official]

Markdown supports it:
**>The expandable block quotation started right after the previous block quotation

It is separated from the previous block quotation by an empty bold entity
Expandable block quotation continued
Hidden by default part of the expandable block quotation started
Expandable block quotation continued
The last line of the expandable block quotation with the expandability mark||

read more here:
https://core.telegram.org/bots/api#markdownv2-style

[EgorKhabarov]

Indeed! I didn't know that. Corrected.

[coder2020official]

and you tested different cases?

[EgorKhabarov]

Yes

from telebot import TeleBot
from telebot.formatting import hcite, mcite


bot = TeleBot(token)

bot.parse_mode = "HTML"
bot.send_message(chat_id, hcite("123"*123))
bot.send_message(chat_id, hcite("123"*123, expandable=True))

bot.parse_mode = "MarkdownV2"
bot.send_message(chat_id, mcite("123"*123))
bot.send_message(chat_id, mcite("123"*123, expandable=True))

[Badiboy]

Thank you all )