Ability to ignore individual messages.

[ara4n]

Suggestion

Occasionally somebody posts a message which is really ugly/distracting/stupid and keeps cluttering up your timeline. You don't want to ignore the user outright, given they sometimes post useful stuff, but you could do without seeing this message every time you switch to a given conversation.

It would be nice if we could maintain a list of events somewhere which your client can ignore. Simplest case, I guess it'd be a list in account_data similar to ignoring users.

See also matrix-org/matrix-spec-proposals#3840 and matrix-org/matrix-spec-proposals#2270 etc.