systray,support context menus for SNI items

--SNI items are handling the context menu by their
own, so Latte code should not interfere

BUG:419263
FIXED-IN:0.9.11

app/view/contextmenu.cpp

@@ -146,14 +146,22 @@ bool ContextMenu::mousePressEvent(QMouseEvent *event)
                     Plasma::Containment *internalC = m_latteView->layout()->internalContainmentOf(applet);
 
                     if (internalC) {
+                        Plasma::Applet *internalApplet{nullptr};
+
                         for (const Plasma::Applet *appletCont : internalC->applets()) {
                             PlasmaQuick::AppletQuickItem *ai2 = appletCont->property("_plasma_graphicObject").value<PlasmaQuick::AppletQuickItem *>();
 
                             if (ai2 && ai2->isVisible() && ai2->contains(ai2->mapFromItem(m_latteView->contentItem(), event->pos()))) {
-                                applet = ai2->applet();
+                                internalApplet = ai2->applet();
                                 break;
                             }
                         }
+
+                        if (!internalApplet) {
+                            return true;
+                        } else {
+                            applet = internalApplet;
+                        }
                     }
 
                     break;