2bc3924672
Fixes #16284. Most of the work for this was done when we implemented correct behavior for guest users, since they treat public streams like private streams anyway. The general method involves moving the messages to the new stream with special care of UserMessage. We delete UserMessages for subs who are losing access to the message. For private streams with protected history, we also create UserMessage elements for users who are not present in the old stream, since that's important for those users to access the moved messages.
Zulip overview
Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conversations. Zulip is used by open source projects, Fortune 500 companies, large standards bodies, and others who need a real-time chat system that allows users to easily process hundreds or thousands of messages a day. With over 500 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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