We need to clear plugin actions too

src/kmmainwidget.cpp

@@ -4209,6 +4209,11 @@ void KMMainWidget::clearFilterActions()
     mFilterCommands.clear();
 }
 
+void KMMainWidget::clearPluginActions()
+{
+    //KMailPluginInterface::self()->clearPluginActions(QStringLiteral("kmail"), mGUIClient);
+}
+
 void KMMainWidget::initializePluginActions()
 {
     KMailPluginInterface::self()->initializePluginActions(QStringLiteral("kmail"), mGUIClient);

src/kmmainwidget.h

@@ -186,6 +186,7 @@ public:
     QAction *akonadiStandardAction(Akonadi::StandardMailActionManager::Type type);
     QWidget *zoomLabelIndicator() const;
 
+    void clearPluginActions();
 public Q_SLOTS:
 
     /**

src/kmmainwin.cpp

@@ -157,6 +157,7 @@ void KMMainWin::slotUpdateGui()
     // remove dynamically created actions before editing
     mKMMainWidget->clearFilterActions();
     mKMMainWidget->tagActionManager()->clearActions();
+    mKMMainWidget->clearPluginActions();
 
     createGUI(QStringLiteral("kmmainwin.rc"));
     applyMainWindowSettings(KMKernel::self()->config()->group("Main Window"));