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`rust/src/sliding_sync/room_lists/filter.rs` holds `filter_membership_for_sync` and `filter_rooms_using_tables` over `RoomForUser`, the Rust form of `RoomsForUserSlidingSync`. The caller passes the DM rooms, the user's tags and whether the connection sent a room before, which decides the state-reset keep rule. The `spaces` and `room_name_like` filters return an error, as Python raises `NotImplementedError` for them. The filtered rooms keep their input order. Python's are in set order. The differential test calls Python's method with a stand-in store over 2000 generated room sets and filters. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01L51DoxB8VnH8UjXJFDgpNG