We should support revealing whether the user is currently typing on mobile/web/etc (SPEC-128)

[matrixbot]

It'd be fun and useful to optionally show whether a user is currently interacting with matrix via a phone, browser or whatever. a bit like fb does. it'd make people more sympathetic to typos and response time etc

(Imported from https://matrix.org/jira/browse/SPEC-128)

(Reported by @ara4n)

[matrixbot]

Jira watchers: @ara4n

[gergelypolonkai]

To remain compatible with old clients, I'd suggest a new key in m.typing. I can't come up with a good name, so let's call it user_ids_ex. The new content then would be:

{
  "user_ids": ["u1", "u2"],
  "user_ids_ex": {
    "u1": ["m.web", "im.riot.web"],
    "u2": ["m.mobile", "im.riot.android"]
  }
}

The idea here is the first value is a standard one, while the second is a custom one, so clients aware of the latter type can even show an icon of that client. Or maybe just stick to one value.

In a future (final v1?) version user_ids_ex could even completely replace the old one.

[gergelypolonkai]

Oh, and users should also choose not to disclose their client type, which may be denoted as m.undisclosed.

[turt2live]

and what the user is "typing", eg: uploading files (https:/vector-im/riot-web/issues/7068) or recording a video/audio clip.