enable scrolling activation only for expandable

--systrays/internal containments are blocked from
this

app/view/containmentinterface.cpp

@@ -488,7 +488,7 @@ void ContainmentInterface::toggleAppletExpanded(const int id)
     }
 
     for (const auto applet : m_view->containment()->applets()) {
-        if (applet->id() == (uint)id) {
+        if (applet->id() == (uint)id && !m_view->layout()->isInternalContainment(applet)/*block for internal containments*/) {
             PlasmaQuick::AppletQuickItem *ai = applet->property("_plasma_graphicObject").value<PlasmaQuick::AppletQuickItem *>();
 
             if (ai) {

containment/package/contents/ui/applet/AppletItem.qml

@@ -663,7 +663,7 @@ Item {
         }
 
         onWheelScrolled: {
-            if (!root.mouseWheelActions || viewSignalsConnector.blockWheel
+            if (!appletItem.applet || !root.mouseWheelActions || viewSignalsConnector.blockWheel
                     || (root.latteViewIsHidden || root.inSlidingIn || root.inSlidingOut)) {
                 return;
             }
@@ -671,7 +671,7 @@ Item {
             blockWheel = true;
             scrollDelayer.start();
 
-            if (appletItem.containsPos(pos) /*&& root.latteView.extendedInterface.appletIsExpandable(applet.id)*/) {
+            if (appletItem.containsPos(pos) && root.latteView.extendedInterface.appletIsExpandable(applet.id)) {
                 var angle = angleDelta.y / 8;
                 var expanded = root.latteView.extendedInterface.appletIsExpanded(applet.id);