12650c1bec
This breaks an indirect dependency of stream_data on the channel module. It's a verbatim code move, apart from the one-line helper `has_history_for`. It's not totally clear to me why the original code doesn't call into `is_complete_for_stream_id` to early-exit, but figuring that out is outside the scope of my change. It's possible that we will eventually just subsume this tiny module into topic_list once we finish breaking all dependencies, but we may want to reuse this for something like Recent Topics or other similar UIs. It's also possible that we'll want to rename stream_topic_history -> stream_topic_history_data sometime soon, possibly after we clean up its dependency on message_util soon.
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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 700 contributors merging over 500 commits a month, Zulip is also the largest and fastest growing open source group chat project.
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