Optional can_True, if a button that calls stopPendingMessage to stop further message generation must be shown.
Chat identifier.
Content of the message; always of the type messageText or messageRichMessage.
Unique identifier of the message draft within the message thread.
The forum topic identifier in which the message will be sent; 0 if none.
Optional keep_True, if the pending message must not be automatically deleted when the user presses the Stop button.
A new pending text or rich message was received in a chat with a bot. The message must be shown in the chat for at most getOption("pending_text_message_period") seconds, replace any other pending message with the same draft_id with animation, and be deleted whenever any incoming message or a pending message with another draft_id is received in the message thread. Subtype of Update.