applets/activitybar: add "Configure Activities" menu item

This menu item will open Activities KCM, which makes the configuration
easier to be found.

applets/activitybar/contents/ui/main.qml

@@ -12,6 +12,7 @@ import org.kde.plasma.core 2.0 as PlasmaCore
 import org.kde.plasma.components 2.0 as PlasmaComponents // PC3 Tabbar only has top and bottom tab positions, not left and right
 
 import org.kde.activities 0.1 as Activities
+import org.kde.kquickcontrolsaddons 2.1 // For KCMShell
 
 Item {
     Layout.minimumWidth: tabBar.implicitWidth
@@ -19,6 +20,10 @@ Item {
 
     Plasmoid.preferredRepresentation: Plasmoid.fullRepresentation
 
+    function action_activitieskcm() {
+        KCMShell.openSystemSettings("kcm_activities");
+    }
+
     PlasmaComponents.TabBar {
         id: tabBar
 
@@ -85,5 +90,9 @@ Item {
 
     Component.onCompleted: {
         Plasmoid.removeAction("configure");
+
+        if (KCMShell.authorize("kcm_activities.desktop").length > 0) {
+            Plasmoid.setAction("activitieskcm", i18nc("@action:inmenu", "&Configure Activities…"), "configure");
+        }
     }
 }