Reactions aren't encrypted in E2EE rooms.

[ara4n]

We should figure out how to do encrypted reactions in E2EE rooms properly and actually implement it.

[erkinalp]

Just encrypt them as if they were message events?

[t3chguy]

@erkinalp the server has to know which event they relate to so that it can give clients list of relations per-event. Also that isn't the issue, the issue is doing it whilst respecting some form of backwards compatibility as m.reaction didn't go through a sane speccing process.

[Sorunome]

Relevant thoughts on this on a relevant MSC: #1849 (comment)

[Sorunome]

Also duplicate of https://github.com/matrix-org/matrix-doc/issues/2678 ?

[uhoreg]

Also duplicate of matrix-org/matrix-spec#660 ?

Yes. I knew there was an issue for this already.