qt: Make TransactionView aware of runtime palette change

This change fixes the GUI when changing appearance on macOS.

src/qt/transactionview.cpp

@@ -37,8 +37,8 @@
 #include <QUrl>
 #include <QVBoxLayout>
 
-TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *parent) :
-    QWidget(parent)
+TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *parent)
+    : QWidget(parent), m_platform_style{platformStyle}
 {
     // Build filter row
     setContentsMargins(0,0,0,0);
@@ -243,6 +243,20 @@ void TransactionView::setModel(WalletModel *_model)
     }
 }
 
+void TransactionView::changeEvent(QEvent* e)
+{
+#ifdef Q_OS_MACOS
+    if (e->type() == QEvent::PaletteChange) {
+        watchOnlyWidget->setItemIcon(
+            TransactionFilterProxy::WatchOnlyFilter_Yes,
+            m_platform_style->SingleColorIcon(QStringLiteral(":/icons/eye_plus")));
+        watchOnlyWidget->setItemIcon(
+            TransactionFilterProxy::WatchOnlyFilter_No,
+            m_platform_style->SingleColorIcon(QStringLiteral(":/icons/eye_minus")));
+    }
+#endif
+}
+
 void TransactionView::chooseDate(int idx)
 {
     if (!transactionProxyModel) return;

src/qt/transactionview.h

@@ -60,6 +60,9 @@ public:
         MINIMUM_COLUMN_WIDTH = 23
     };
 
+protected:
+    void changeEvent(QEvent* e) override;
+
 private:
     WalletModel *model{nullptr};
     TransactionFilterProxy *transactionProxyModel{nullptr};
@@ -85,6 +88,8 @@ private:
 
     bool eventFilter(QObject *obj, QEvent *event) override;
 
+    const PlatformStyle* m_platform_style;
+
 private Q_SLOTS:
     void contextualMenu(const QPoint &);
     void dateRangeChanged();