Commits on Aug 16, 2023

1. zcash_client_sqlite: Ensure that target and anchor heights are relati… …

   …ve to the chain tip.
   
   Prior to the scan-before-sync changes, the wallet was able to assume
   that the maximum scanned block height at the time of the spend was
   within a few blocks of the chain tip. However, under linear scanning
   after the spend-before-sync changes this invariant no longer holds,
   resulting in a situation where in linear sync conditions the wallet
   could attempt to create transactions with already-past expiry heights.
   
   This change separates the notion of "chain tip" from "max scanned
   height", relying upon the `scan_queue` table to maintain the wallet's
   view of the consensus chain height and using information from the
   `blocks` table only in situations where the latest and/or earliest
   scanned height is required.
   
   As part of this change, the `WalletRead` interface is also modified to
   disambiguate these concepts.

   

   nuttycom committed Aug 16, 2023
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