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perf(chat): virtualize the timeline by segment, not by turn #547

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Merged
Tryanks merged 1 commit into from
Sep 27, 2026
Merged

perf(chat): virtualize the timeline by segment, not by turn #547

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11 changes: 11 additions & 0 deletions crates/core/src/session.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -551,6 +551,17 @@ impl Timeline {
timeline
}

/// Fold records a client already holds, without cloning their payloads:
/// a history page refolds the whole held log, whose tool outputs and
/// diffs are the bulk of it.
pub fn fold_stored<'a>(records: impl IntoIterator<Item = &'a StoredEvent>) -> Self {
let mut timeline = Self::default();
for record in records {
timeline.apply_stored(record);
}
timeline
}

/// Fold one record, remembering whether it carried a shortened output.
pub fn apply_stored(&mut self, stored: &StoredEvent) {
if let Some(bytes) = stored.elided
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