Two issues shared one root cause: the shielded-receive scan marked each z-address "scanned
at the EXACT current tip," but a new block (~36s on DRGX) advances the tip and invalidates
every prior per-address scan. A wallet with more z-addresses than one refresh cycle can
scan therefore never reached "all scanned at tip" — so shieldedScanComplete stayed false
and transactions_dirty_ stayed true forever, which (a) kept the history-refresh banner lit
and the full rescan churning every cycle, and (b) blocked maybeFinishTransactionSendProgress
(it waited on transactions_dirty_), leaving the send-progress indicator stuck on.
Fix 1 — completion tolerance. Add TransactionRefreshSnapshot::shieldedScanTipTolerance: an
address counts as fresh if its last scan is within N blocks of the tip (0 = old strict
behavior, so existing tests are unchanged). The app scales N with the z-address count
(2 + count/96, capped at 50), so a multi-block pass can COMPLETE before its earliest scan
goes stale. This also throttles full rescans to ~N blocks instead of every block —
transactions_dirty_ clears, the banner stops, and CPU/RPC churn drops. Already-fresh
addresses are skipped, so the per-block cost falls back to just the (cheap) transparent
listtransactions.
Fix 2 — send-progress gate. maybeFinishTransactionSendProgress() no longer waits on the
transaction history scan (transactions_dirty_ / Transactions job): the sent tx is already
shown via the optimistic pending insert, and the spend is reflected once the balance
refresh lands, so it now finishes on the address/balance signal alone.
Test: a tolerant snapshot skips recently-scanned addresses (shieldedAddressesScanned == 0,
shieldedScanComplete) while a strict one re-scans them.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
DanS
63b3a04716