Update color when we change theme

src/kontactplugin/summary/summaryview_part.cpp

@@ -428,8 +428,9 @@ void SummaryViewPart::initGUI(KontactInterface::Core *core)
     mMainWidget->setFocusPolicy(Qt::StrongFocus);
     setWidget(sa);
 
-    // KF5: port it
-    // connect(KGlobalSettings::self(), &KGlobalSettings::kdisplayPaletteChanged, this, &SummaryViewPart::slotAdjustPalette);
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    connect(qApp, &QApplication::paletteChanged, this, &SummaryViewPart::slotAdjustPalette);
+#endif
     slotAdjustPalette();
 
     mMainLayout = new QVBoxLayout(mMainWidget);
@@ -506,3 +507,13 @@ QString SummaryViewPart::widgetName(QWidget *widget) const
 
     return {};
 }
+
+bool SummaryViewPart::event(QEvent *e)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    if (e->type() == QEvent::ApplicationPaletteChange) {
+        slotAdjustPalette();
+    }
+#endif
+    return KParts::Part::event(e);
+}

src/kontactplugin/summary/summaryview_part.h

@@ -49,6 +49,7 @@ Q_SIGNALS:
 protected:
     void partActivateEvent(KParts::PartActivateEvent *event) override;
 
+    bool event(QEvent *e) override;
 protected Q_SLOTS:
     void slotConfigure();
     void updateWidgets();