qt: Make RPCConsole aware of runtime palette change

This change fixes the GUI when changing appearance on macOS.

Author: hebasto

src/qt/rpcconsole.cpp

@@ -817,6 +817,25 @@ void RPCConsole::keyPressEvent(QKeyEvent *event)
     }
 }
 
+void RPCConsole::changeEvent(QEvent* e)
+{
+#ifdef Q_OS_MACOS
+    if (e->type() == QEvent::PaletteChange) {
+        ui->clearButton->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/remove")));
+        ui->fontBiggerButton->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/fontbigger")));
+        ui->fontSmallerButton->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/fontsmaller")));
+        ui->promptIcon->setIcon(platformStyle->SingleColorIcon(QStringLiteral(":/icons/prompticon")));
+
+        for (int i = 0; ICON_MAPPING[i].url; ++i) {
+            ui->messagesWidget->document()->addResource(
+                QTextDocument::ImageResource,
+                QUrl(ICON_MAPPING[i].url),
+                platformStyle->SingleColorImage(ICON_MAPPING[i].source).scaled(QSize(consoleFontSize * 2, consoleFontSize * 2), Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
+        }
+    }
+#endif
+}
+
 void RPCConsole::message(int category, const QString &message, bool html)
 {
     QTime time = QTime::currentTime();

src/qt/rpcconsole.h

@@ -74,6 +74,7 @@ class RPCConsole: public QWidget
 protected:
     virtual bool eventFilter(QObject* obj, QEvent *event) override;
     void keyPressEvent(QKeyEvent *) override;
+    void changeEvent(QEvent* e) override;
 
 private Q_SLOTS:
     void on_lineEdit_returnPressed();