qt: Make OverviewPage aware of runtime palette change

This change fixes the GUI when changing appearance on macOS.

Author: hebasto

src/qt/overviewpage.cpp

@@ -78,6 +78,7 @@ class TxViewDelegate : public QAbstractItemDelegate
         {
             QIcon iconWatchonly = qvariant_cast<QIcon>(index.data(TransactionTableModel::WatchonlyDecorationRole));
             QRect watchonlyRect(boundingRect.right() + 5, mainRect.top()+ypad+halfheight, 16, halfheight);
+            iconWatchonly = platformStyle->TextColorIcon(iconWatchonly);
             iconWatchonly.paint(painter, watchonlyRect);
             address_rect_min_width += 5 + watchonlyRect.width();
         }
@@ -143,14 +144,15 @@ OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent)
     ui(new Ui::OverviewPage),
     clientModel(nullptr),
     walletModel(nullptr),
+    m_platform_style{platformStyle},
     txdelegate(new TxViewDelegate(platformStyle, this))
 {
     ui->setupUi(this);
 
     m_balances.balance = -1;
 
     // use a SingleColorIcon for the "out of sync warning" icon
-    QIcon icon = platformStyle->SingleColorIcon(":/icons/warning");
+    QIcon icon = m_platform_style->SingleColorIcon(QStringLiteral(":/icons/warning"));
     ui->labelTransactionsStatus->setIcon(icon);
     ui->labelWalletStatus->setIcon(icon);
 
@@ -298,6 +300,17 @@ void OverviewPage::setWalletModel(WalletModel *model)
     updateDisplayUnit();
 }
 
+void OverviewPage::changeEvent(QEvent* e)
+{
+#ifdef Q_OS_MACOS
+    if (e->type() == QEvent::PaletteChange) {
+        QIcon icon = m_platform_style->SingleColorIcon(QStringLiteral(":/icons/warning"));
+        ui->labelTransactionsStatus->setIcon(icon);
+        ui->labelWalletStatus->setIcon(icon);
+    }
+#endif
+}
+
 void OverviewPage::updateDisplayUnit()
 {
     if(walletModel && walletModel->getOptionsModel())

src/qt/overviewpage.h

@@ -45,13 +45,18 @@ public Q_SLOTS:
     void transactionClicked(const QModelIndex &index);
     void outOfSyncWarningClicked();
 
+protected:
+    void changeEvent(QEvent* e) override;
+
 private:
     Ui::OverviewPage *ui;
     ClientModel *clientModel;
     WalletModel *walletModel;
     interfaces::WalletBalances m_balances;
     bool m_privacy{false};
 
+    const PlatformStyle* m_platform_style;
+
     TxViewDelegate *txdelegate;
     std::unique_ptr<TransactionFilterProxy> filter;