fix #285,expanded to false for applets

--when changing session all the applets from
the previous session should hide their
expanded options

app/dockcorona.cpp

@@ -511,6 +511,7 @@ void DockCorona::syncDockViews()
         if (view->session() != currentSession()) {
             qDebug() << "deleting view that does not belong in this session...";
             auto viewToDelete = m_dockViews.take(view->containment());
+            viewToDelete->deactivateApplets();
             viewToDelete->deleteLater();
             //! which explicit docks can be deleted
         } else if (!found && !view->onPrimary() && (m_dockViews.size() > 1) && m_dockViews.contains(view->containment())

app/dockview.cpp

@@ -1066,6 +1066,21 @@ void DockView::closeApplication()
         dockCorona->closeApplication();
 }
 
+void DockView::deactivateApplets()
+{
+    if (!containment()) {
+        return;
+    }
+
+    foreach (auto applet, containment()->applets()) {
+        PlasmaQuick::AppletQuickItem *ai = applet->property("_plasma_graphicObject").value<PlasmaQuick::AppletQuickItem *>();
+
+        if (ai) {
+            ai->setExpanded(false);
+        }
+    }
+}
+
 QVariantList DockView::containmentActions()
 {
     QVariantList actions;

app/dockview.h

@@ -139,6 +139,8 @@ public:
 
     VisibilityManager *visibility() const;
 
+    void deactivateApplets();
+
     QQmlListProperty<QScreen> screens();
     static int countScreens(QQmlListProperty<QScreen> *property);
     static QScreen *atScreens(QQmlListProperty<QScreen> *property, int index);