fix tray menu loading

Modules/TrayItem.qml

@@ -12,6 +12,7 @@ MouseArea {
     required property SystemTrayItem item
     required property PanelWindow bar
     property point globalPos
+    property bool hasLoaded: false
 
     implicitWidth: 22
 
@@ -54,6 +55,12 @@ MouseArea {
                 trayMenu.trayMenu = null;
             }
         }
+
+        function onFinishedLoading() {
+            if ( !root.hasLoaded )
+                trayMenu.visible = false;
+                root.hasLoaded = true;
+        }
     }
 
     onClicked: {