State events from blocked users should not be shown to clients

[everypizza1]

Suggestion
In the client-server API, this is said:

Servers must still send state events sent by ignored users to clients.

Ignoring a user should imply that you won't see anything from said user, including joins, leaves, display name changes, avatar changes, etc.

[KitsuneRal]

This is problematic in case the user gets un-ignored at some later point. If state events are not sent, I as the ignoring/un-ignoring side have no idea whether that user is gone, if their display name is current etc. Clients are expected to hide all events from ignored users, but they have to keep track of what is happening to those users.

[everypizza1]

Clients are expected to hide all events from ignored users, but they have to keep track of what is happening to those users.

I haven't seen this in the spec at all, and multiple clients I've tried (gomuks, fluffychat, even element x) don't hide state events from blocked users. I also wasn't able to block users at all until conduwuit implemented it server-side in any of those clients.

[clokep]

but they have to keep track of what is happening to those users.

An option could be to always redact the state events of blocked users? I think that would allow the "room state" to maintain intact while blocking potentially abusive content from them. This would work well for joins, topics, etc.

This probably breaks down with some events though (e.g. power levels).