fix #472,support latte applet active indicators

--expose the functionality through the configuration
window. The user can choose no latte type internal
active applets indicators, only show to latte internal
applets and show at all applets

containment/package/contents/config/main.xml

@@ -84,6 +84,15 @@
         </choices>
       <default>2</default>
     </entry>
+    <entry name="activeIndicator" type="Enum">
+      <label>Show active indicator</label>
+        <choices>
+          <choice name="None"/>
+          <choice name="Internal"/>
+          <choice name="All"/>
+        </choices>
+      <default>1</default>
+    </entry>
     <entry name="maxLength" type="Int">
       <default>100</default>
     </entry>

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

@@ -320,7 +320,16 @@ Item{
         }
     }
 
-    ActiveIndicator{}
+    Loader{
+        anchors.fill: parent
+        active: root.activeIndicator === Latte.Dock.AllIndicator
+                || (root.activeIndicator === Latte.Dock.InternalsIndicator && fakeIconItem)
+
+        sourceComponent: Item{
+            anchors.fill: parent
+            ActiveIndicator{}
+        }
+    }
 
     Item{
         id:_wrapperContainer

containment/package/contents/ui/main.qml

@@ -93,6 +93,8 @@ DragDrop.DropArea {
 
     property alias hoveredIndex: layoutsContainer.hoveredIndex
 
+    property int activeIndicator: plasmoid.configuration.activeIndicator
+
     property int actionsBlockHiding: 0 //actions that block hiding
 
     property int animationsNeedBothAxis:0 //animations need space in both axes, e.g zooming a task

liblattedock/dock.h

@@ -84,6 +84,13 @@ public:
         CycleThroughTasks
     };
     Q_ENUM(TaskAction)
+
+    enum ActiveAppletIndicator {
+        NoneIndicator = 0,
+        InternalsIndicator = 1,
+        AllIndicator = 2
+    };
+    Q_ENUM(ActiveAppletIndicator)
 };
 
 }//end of namespace

shell/package/contents/configuration/TweaksConfig.qml

@@ -174,6 +174,73 @@ PlasmaComponents.Page {
         }
         //! END: Behavior
 
+        //! BEGIN: Active Indicator
+        ColumnLayout {
+            Layout.fillWidth: true
+            spacing: units.smallSpacing
+            visible: plasmoid.configuration.advanced
+
+            Header {
+                text: i18n("Active Applet Indicator")
+            }
+
+            RowLayout{
+                Layout.fillWidth: true
+                Layout.leftMargin: units.smallSpacing * 2
+                Layout.rightMargin: units.smallSpacing * 2
+                spacing: 2
+
+                RowLayout {
+                    Layout.fillWidth: true
+
+                    spacing: units.smallSpacing
+
+                    property int activeIndicator: plasmoid.configuration.activeIndicator
+
+                    ExclusiveGroup {
+                        id: activeIndicatorGroup
+                        onCurrentChanged: {
+                            if (current.checked)
+                                plasmoid.configuration.activeIndicator = current.activeIndicator
+                        }
+                    }
+
+                    PlasmaComponents.Button {
+                        Layout.fillWidth: true
+
+                        text: i18nc("active indicator to no applets", "None")
+                        checked: parent.activeIndicator === activeIndicator
+                        checkable: true
+                        exclusiveGroup: activeIndicatorGroup
+
+                        readonly property int activeIndicator: Latte.Dock.NoneIndicator
+                    }
+                    PlasmaComponents.Button {
+                        Layout.fillWidth: true
+
+                        text: i18nc("active indicator only to in-house latte applets", "Internals")
+                        checked: parent.activeIndicator === activeIndicator
+                        checkable: true
+                        exclusiveGroup: activeIndicatorGroup
+
+                        readonly property int activeIndicator: Latte.Dock.InternalsIndicator
+                    }
+                    PlasmaComponents.Button {
+                        Layout.fillWidth: true
+
+                        text: i18nc("active indicator to all applets", "All")
+                        checked: parent.activeIndicator === activeIndicator
+                        checkable: true
+                        exclusiveGroup: activeIndicatorGroup
+
+                        readonly property int activeIndicator: Latte.Dock.AllIndicator
+                    }
+                }
+            }
+        }
+        //! END: Active Indicator
+
+
         //! BEGIN: Session
         ColumnLayout {
             spacing: units.smallSpacing