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240ea294d5doc: update doxygen documention of ComputeTimeSmart() and AddToWalletIfInvolvingMe() regarding rescanning_old_block parameter (BitcoinTsunami)d6eb39af21test: add functional test to check transaction time determination during block rescanning (BitcoinTsunami)07b44f16e7wallet: fix ComputeTimeSmart algorithm to use blocktime during old block rescanning (BitcoinTsunami) Pull request description: The function ComputeTimeSmart in wallet.cpp assume that transaction are discovered in the right order. Moreover the 'smarttime' determination algorithm is coded with realtime scenario in mind and not rescanning of old block. The functional test demonstrate that if the user import a wallet, then rescan only recent history, and then rescan the entire history, the older transaction discovered would have an incorrect time determination. In the context of rescanning old block, the only time value that as a meaning is the blocktime. That's why I've fixed the problem with a simple separation between rescanning of old block and realtime time determination. The fix is written to have no impact on every realtime scenario and only impact the behaviour during a rescanning process. This PR Fixes #20181. To be fair, I don't think that this bug could be triggered with the wallet GUI, because it always proceed with a proper rescan. But RPC API provide the possibility to trigger it. I've discovered it, because Specter desktop v0.10.0 was impacted. (https://github.com/cryptoadvance/specter-desktop/issues/680). ACKs for top commit: jonatack: ACK240ea294d5per `git diff b92d552 240ea29`, re-verified rebase to latest master + debug build clean + new test passes on the branch and fails on master, only change since my review a few hours ago is incorporation of latest review suggestions meshcollider: re-utACK240ea294d5Tree-SHA512: 514b02e41d011ddfa325f5e8080b93800e1ea4ed5853fa420670a6ac700e8b463000dbea65f8ced8565cfb950c7f51b69154034dcb111e67aca3b964a0061494