doc: update doxygen documention of ComputeTimeSmart() and AddToWalletIfInvolvingMe() regarding rescanning_old_block parameter

Author: BitcoinTsunami

src/wallet/wallet.cpp

@@ -2384,6 +2384,8 @@ void CWallet::GetKeyBirthTimes(std::map<CKeyID, int64_t>& mapKeyBirth) const {
  * - If sending a transaction, assign its timestamp to the current time.
  * - If receiving a transaction outside a block, assign its timestamp to the
  *   current time.
+ * - If receiving a transaction during a rescanning process, assign all its
+ *   (not already known) transactions' timestamps to the block time.
  * - If receiving a block with a future timestamp, assign all its (not already
  *   known) transactions' timestamps to the current time.
  * - If receiving a block with a past timestamp, before the most recent known

src/wallet/wallet.h

@@ -271,6 +271,9 @@ class CWallet final : public WalletStorage, public interfaces::Chain::Notificati
      * abandoned is an indication that it is not safe to be considered abandoned.
      * Abandoned state should probably be more carefully tracked via different
      * posInBlock signals or by checking mempool presence when necessary.
+     *
+     * Should be called with rescanning_old_block set to true, if the transaction is
+     * not discovered in real time, but during a rescan of old blocks.
      */
     bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, CWalletTx::Confirmation confirm, bool fUpdate, bool rescanning_old_block) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);