wallet: add taprootEnabled() to interface

src/interfaces/wallet.h

@@ -256,6 +256,9 @@ public:
     // Return whether private keys enabled.
     virtual bool privateKeysDisabled() = 0;
 
+    // Return whether the wallet contains a Taproot scriptPubKeyMan
+    virtual bool taprootEnabled() = 0;
+
     // Return whether wallet uses an external signer.
     virtual bool hasExternalSigner() = 0;
 

src/wallet/interfaces.cpp

@@ -461,6 +461,11 @@ public:
     bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }
     bool hasExternalSigner() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER); }
     bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }
+    bool taprootEnabled() override {
+        if (m_wallet->IsLegacy()) return false;
+        auto spk_man = m_wallet->GetScriptPubKeyMan(OutputType::BECH32M, /*internal=*/false);
+        return spk_man != nullptr;
+    }
     OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }
     CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
     void remove() override