Merge bitcoin#22214: refactor: Rearrange fillPSBT arguments

f47e802 Rearrange fillPSBT arguments (Russell Yanofsky)

Pull request description:

  Move fillPSBT inout argument before output-only arguments. This is a nice thing to do to keep the interface style [consistent](https://google.github.io/styleguide/cppguide.html#Inputs_and_Outputs). But motivation is to work around a current limitation of the libmultiprocess code generator (which figures out order of inout parameters by looking at input list, but more ideally would use the output list).

  ---

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10). The commit was first part of larger PR bitcoin#10102.

ACKs for top commit:
  achow101:
    ACK f47e802
  theStack:
    Code-review ACK f47e802

Tree-SHA512: 1787af3031ff7ed6b519f3b93054d8b257af96a3380a476a6dab0f759329039ecc5d624b785c5c2d14d594fc852dd81c626880c775c691ec9c79b7b3dbcfb257

Author: fanquake

src/interfaces/wallet.h

@@ -206,9 +206,9 @@ class Wallet
     virtual TransactionError fillPSBT(int sighash_type,
         bool sign,
         bool bip32derivs,
+        size_t* n_signed,
         PartiallySignedTransaction& psbtx,
-        bool& complete,
-        size_t* n_signed) = 0;
+        bool& complete) = 0;
 
     //! Get balances.
     virtual WalletBalances getBalances() = 0;

src/qt/psbtoperationsdialog.cpp

@@ -50,7 +50,7 @@ void PSBTOperationsDialog::openWithPSBT(PartiallySignedTransaction psbtx)
     bool complete;
     size_t n_could_sign;
     FinalizePSBT(psbtx);  // Make sure all existing signatures are fully combined before checking for completeness.
-    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */,  m_transaction_data, complete, &n_could_sign);
+    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */, &n_could_sign, m_transaction_data, complete);
     if (err != TransactionError::OK) {
         showStatus(tr("Failed to load transaction: %1")
             .arg(QString::fromStdString(TransactionErrorString(err).translated)), StatusLevel::ERR);
@@ -67,7 +67,7 @@ void PSBTOperationsDialog::signTransaction()
 {
     bool complete;
     size_t n_signed;
-    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, true /* sign */, true /* bip32derivs */, m_transaction_data, complete, &n_signed);
+    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, true /* sign */, true /* bip32derivs */, &n_signed, m_transaction_data, complete);
 
     if (err != TransactionError::OK) {
         showStatus(tr("Failed to sign transaction: %1")
@@ -226,7 +226,7 @@ void PSBTOperationsDialog::showStatus(const QString &msg, StatusLevel level) {
 size_t PSBTOperationsDialog::couldSignInputs(const PartiallySignedTransaction &psbtx) {
     size_t n_signed;
     bool complete;
-    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, false /* bip32derivs */, m_transaction_data, complete, &n_signed);
+    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, false /* bip32derivs */, &n_signed, m_transaction_data, complete);
 
     if (err != TransactionError::OK) {
         return 0;

src/qt/sendcoinsdialog.cpp

@@ -487,7 +487,7 @@ void SendCoinsDialog::sendButtonClicked([[maybe_unused]] bool checked)
         CMutableTransaction mtx = CMutableTransaction{*(m_current_transaction->getWtx())};
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
-        const TransactionError err = model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */, psbtx, complete, nullptr);
+        const TransactionError err = model->wallet().fillPSBT(SIGHASH_ALL, false /* sign */, true /* bip32derivs */, nullptr, psbtx, complete);
         assert(!complete);
         assert(err == TransactionError::OK);
         // Serialize the PSBT

src/wallet/interfaces.cpp

@@ -367,9 +367,9 @@ class WalletImpl : public Wallet
     TransactionError fillPSBT(int sighash_type,
         bool sign,
         bool bip32derivs,
+        size_t* n_signed,
         PartiallySignedTransaction& psbtx,
-        bool& complete,
-        size_t* n_signed) override
+        bool& complete) override
     {
         return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign, bip32derivs, n_signed);
     }