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36844418e9
For certain queries where both include_history and use_first_unread_anchor are set to True, we were excluding historical rows. Now we only use the use_first_unread_anchor flag to filter rows that we use to find the anchor, without having it filter the actual search results. The bug went unreported for a long time, because it only affected mobile users who had newly subscribed to streams. Note that we make a small change to the test called test_use_first_unread_anchor_with_muted_topics, which has a very scary comment about being "arcane" and "be absolutely sure you know what you're doing." I think it's fine. Also, the new test code would fail before this fix, so it should help prevent future regressions. Fixes #8958