Add support for image bodies as captions MSC2530

[Cadair]

The Problem

matrix-org/matrix-spec-proposals#2530

The Solution

One message to describe them all.

Alternatives

No response

Additional context

No response

Happens in the latest version

• Yes, this feature is still missing.

[deepbluev7]

What changes would that need? You can already put free form text into the media input field?

[Cadair]

It would need changes to render the body in the timeline as well as sending the text inputted at the same time as uploading media as the body of the media message?

[Cadair]

Relevant section of the unstable spec: https://spec.matrix.org/unstable/client-server-api/#media-captions

[Cadair]

As more things are sending these it's becoming harder to read the messages associated with the images. Rendering (if not sending) this content properly would be really nice to have.