Turn local-only threads into a one-way street #2906
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We have an instance that runs a modified fork of Glitch.
Some clients don't automatically copy the eye emoji into a reply to a local-only message and users forget to set it manually. This leads to posts that are intended to be local-only being federated unintentionally.
We'd like to to turn local-only threads into a one-way streets:
Once a post has been made local-only, all replies to it should be local-only as well. This prevents leaking information.
If a user wants to make federated reply in a thread, they should reply to the latest federated post, which would not give away information about the existence of the local-only portions of a thread to users on other instances.