GUI: remove now unneeded 'm_balances' field from overviewpage

src/qt/overviewpage.cpp

@@ -148,8 +148,6 @@ OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent)
 {
     ui->setupUi(this);
 
-    m_balances.balance = -1;
-
     // use a SingleColorIcon for the "out of sync warning" icon
     QIcon icon = m_platform_style->SingleColorIcon(QStringLiteral(":/icons/warning"));
     ui->labelTransactionsStatus->setIcon(icon);
@@ -178,8 +176,9 @@ void OverviewPage::handleTransactionClicked(const QModelIndex &index)
 void OverviewPage::setPrivacy(bool privacy)
 {
     m_privacy = privacy;
-    if (m_balances.balance != -1) {
-        setBalance(m_balances);
+    const auto& balances = walletModel->getCachedBalance();
+    if (balances.balance != -1) {
+        setBalance(balances);
     }
 
     ui->listTransactions->setVisible(!m_privacy);
@@ -198,7 +197,6 @@ OverviewPage::~OverviewPage()
 void OverviewPage::setBalance(const interfaces::WalletBalances& balances)
 {
     BitcoinUnit unit = walletModel->getOptionsModel()->getDisplayUnit();
-    m_balances = balances;
     if (walletModel->wallet().isLegacy()) {
         if (walletModel->wallet().privateKeysDisabled()) {
             ui->labelBalance->setText(BitcoinUnits::formatWithPrivacy(unit, balances.watch_only_balance, BitcoinUnits::SeparatorStyle::ALWAYS, m_privacy));
@@ -306,10 +304,10 @@ void OverviewPage::changeEvent(QEvent* e)
 
 void OverviewPage::updateDisplayUnit()
 {
-    if(walletModel && walletModel->getOptionsModel())
-    {
-        if (m_balances.balance != -1) {
-            setBalance(m_balances);
+    if (walletModel && walletModel->getOptionsModel()) {
+        const auto& balances = walletModel->getCachedBalance();
+        if (balances.balance != -1) {
+            setBalance(balances);
         }
 
         // Update txdelegate->unit with the current unit

src/qt/overviewpage.h

@@ -52,7 +52,6 @@ private:
     Ui::OverviewPage *ui;
     ClientModel *clientModel;
     WalletModel *walletModel;
-    interfaces::WalletBalances m_balances;
     bool m_privacy{false};
 
     const PlatformStyle* m_platform_style;