Deep links: make it possible to pre-fill the first message [i.delta.chat parameters similar to mailto:?body]

In Telegram, there are deep links to start a chat with a bot with some pre-configured text, like t.me/<bot_username>?start=<parameter>.

Since there are no fancy features like bot keyboards in Delta Chat (see this topic: Bots Buttons & Command auto-completion), such small features could greatly improve UX. I know about mailto: links but they can only be used after a chat is created.

Proposal

Add a new parameter to https://i.delta.chat deep links to make launching bots more straightforward.

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We already support mailto:?body=sometext links, on Desktop at least.
Edit: it’s just FYI, not saying that this is the solution to your problem.

We can’t initiate encrypted communication via mailto as it is missing the public key. This means it won’t work on chatmail.

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