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@ -98,6 +98,9 @@ If several reactions race against each other to mark a message as visible or
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hidden, we consider the most recent one (by order of `origin_server_ts`) the
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hidden, we consider the most recent one (by order of `origin_server_ts`) the
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source of truth.
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source of truth.
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For simplicity, if a user gains or loses the powerlevel `m.visibility`, this
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does **not** affect any of the `m.visibility` relations already sent by that user.
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### Example use
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### Example use
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A moderation bot such as Mjölnir might implement two-phase redaction as follows:
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A moderation bot such as Mjölnir might implement two-phase redaction as follows:
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@ -189,6 +192,19 @@ mechanism as it is more complicated and it opens abuse vectors by malicious
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moderators de facto modifying the content of other user's messages (even if this
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moderators de facto modifying the content of other user's messages (even if this
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could be mitigated by clients displaying who has modified a user's messages).
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could be mitigated by clients displaying who has modified a user's messages).
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### Letting users hide their own messages
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There would be use cases for users hiding their own messages, e.g. marking a
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task as complete. We believe that this complicates the present MSC, as it
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introduces edge cases that deserve their own discussion, e.g.:
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- can a moderator make a message hidden by a user visible?
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- how do we reinterpret a sequence of visibility change messages interleaving
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self-hide, self-unhide, moderator-hide, moderator-unhide when one or more
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of the messages in the sequence gets redacted?
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For these reasons, we prefer postponing such feature to a further MSC.
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## Security considerations
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## Security considerations
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### Old clients
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### Old clients
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