The History tab built a txid-to-indices map twice when its inputs
changed, once for the summary-card totals and once for the display list,
each a full pass over every transaction with string-keyed hashing.
- The rows are now grouped by txid a single time whenever the
transaction list changes, into an index-only structure (first/next
chains with no string copies), and both the summary pass and the
display pass reuse it. A sort-combo change re-sorts without regrouping.
Adds a pure, unit-testable groupByTxid helper in
transactions_tab_helpers.h.
Tests: the chains match a reference map over a random id stream, and the
empty and single-row cases.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
DanSandClaude Opus 4.8
a5e4fd5c02