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e3c976fed9
In Zulip, message topics are case-insensitive but case-preserving. The `get_context_for_message` function erroneously did a case-sensitive search, and thus only messages whose topic matched exactly were pulled in as context. Make the missed-message pipeline aware that message topics are not case-sensitive. This means that, when collapsing adjacent messages, we merge messages with topic headers which are "different"; create a separate explicit "grouping" to know which to collapse.