[wallet] GetBalance can take a min_depth argument.

src/wallet/wallet.cpp

@@ -2139,7 +2139,7 @@ void CWallet::ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman
  */
 
 
-CAmount CWallet::GetBalance(const isminefilter& filter) const
+CAmount CWallet::GetBalance(const isminefilter& filter, const int min_depth) const
 {
     CAmount nTotal = 0;
     {
@@ -2147,7 +2147,7 @@ CAmount CWallet::GetBalance(const isminefilter& filter) const
         for (const auto& entry : mapWallet)
         {
             const CWalletTx* pcoin = &entry.second;
-            if (pcoin->IsTrusted()) {
+            if (pcoin->IsTrusted() && pcoin->GetDepthInMainChain() >= min_depth) {
                 nTotal += pcoin->GetAvailableCredit(true, filter);
             }
         }

src/wallet/wallet.h

@@ -943,7 +943,7 @@ public:
     void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) override;
     // ResendWalletTransactionsBefore may only be called if fBroadcastTransactions!
     std::vector<uint256> ResendWalletTransactionsBefore(int64_t nTime, CConnman* connman);
-    CAmount GetBalance(const isminefilter& filter=ISMINE_SPENDABLE) const;
+    CAmount GetBalance(const isminefilter& filter=ISMINE_SPENDABLE, const int min_depth=0) const;
     CAmount GetUnconfirmedBalance() const;
     CAmount GetImmatureBalance() const;
     CAmount GetUnconfirmedWatchOnlyBalance() const;