[SNI] Handle NewMenu signal

Qt uses NewMenu signal to notify when new context menu is set.
It is not part of the official standard but already used by Qt
(starting from Qt 5.11).

BUG: 383202
FIXED-IN: 5.22.0

dataengines/statusnotifieritem/statusnotifieritemsource.cpp

@@ -132,6 +132,7 @@ StatusNotifierItemSource::StatusNotifierItemSource(const QString &notifierItemId
         connect(m_statusNotifierItemInterface, &OrgKdeStatusNotifierItem::NewOverlayIcon, this, &StatusNotifierItemSource::refreshIcons);
         connect(m_statusNotifierItemInterface, &OrgKdeStatusNotifierItem::NewToolTip, this, &StatusNotifierItemSource::refreshToolTip);
         connect(m_statusNotifierItemInterface, &OrgKdeStatusNotifierItem::NewStatus, this, &StatusNotifierItemSource::syncStatus);
+        connect(m_statusNotifierItemInterface, &OrgKdeStatusNotifierItem::NewMenu, this, &StatusNotifierItemSource::refreshMenu);
         refresh();
     }
 }
@@ -179,6 +180,15 @@ void StatusNotifierItemSource::refreshToolTip()
     refresh();
 }
 
+void StatusNotifierItemSource::refreshMenu()
+{
+    if (m_menuImporter) {
+        m_menuImporter->deleteLater();
+        m_menuImporter = nullptr;
+    }
+    refresh();
+}
+
 void StatusNotifierItemSource::refresh()
 {
     if (!m_refreshTimer.isActive()) {

dataengines/statusnotifieritem/statusnotifieritemsource.h

@@ -56,6 +56,7 @@ private Q_SLOTS:
     void refreshTitle();
     void refreshIcons();
     void refreshToolTip();
+    void refreshMenu();
     void refresh();
     void performRefresh();
     void syncStatus(QString);