support per-screen active window tracking

package/contents/config/main.xml

@@ -38,6 +38,10 @@
       <default>true</default>
       <label>if false active window can be on any screen</label>
     </entry>
+    <entry name="perScreenActive" type="Bool">
+      <default>false</default>
+      <label>Per-screen active window</label>
+    </entry>
     <entry name="hiddenState" type="Enum">
       <choices>
          <choice name="SlideOut"/>

package/contents/ui/PlasmaTasksModel.qml

@@ -28,7 +28,7 @@ Item {
     id: plasmaTasksItem
     property bool filterByScreen: true
 
-    readonly property bool existsWindowActive: lastActiveTaskItem && tasksRepeater.count > 0 && lastActiveTaskItem.isActive
+    readonly property bool existsWindowActive: lastActiveTaskItem && tasksRepeater.count > 0 && (root.perScreenActive || lastActiveTaskItem.isActive)
     readonly property bool existsWindowShown: lastActiveTaskItem && tasksRepeater.count > 0 && !lastActiveTaskItem.isMinimized
 
     property Item lastActiveTaskItem: null

package/contents/ui/config/ConfigGeneral.qml

@@ -40,6 +40,7 @@ Item {
     property alias cfg_buttonSizePercentage: buttonSizeSpn.value
     property alias cfg_visibility: root.visibility
     property alias cfg_filterByScreen: byScreenChk.checked
+    property alias cfg_perScreenActive: stickyChk.checked
     property alias cfg_hiddenState: root.hiddenState
     property alias cfg_inactiveStateEnabled: inactiveChk.checked
     property alias cfg_useDecorationMetrics: decorationMetricsChk.checked
@@ -53,6 +54,7 @@ Item {
     property var cfg_containmentType
     property var cfg_containmentTypeDefault
     property var cfg_filterByScreenDefault
+    property var cfg_perScreenActiveDefault
     property var cfg_formFactor
     property var cfg_formFactorDefault
     property var cfg_hiddenStateDefault
@@ -336,6 +338,19 @@ Item {
             }
         }
 
+        GridLayout {
+            Label {
+                Layout.minimumWidth: Math.max(centerFactor * root.width, minimumWidth)
+                text: i18n("Per-screen active window:")
+                horizontalAlignment: Text.AlignRight
+            }
+
+            CheckBox {
+                id: stickyChk
+                text: i18n("Enabled")
+            }
+        }
+
         GridLayout{
             columns: 2
             rows: 2

package/contents/ui/main.qml

@@ -47,6 +47,8 @@ PlasmoidItem {
     property int animatedMinimumWidth: minimumWidth
     property int animatedMinimumHeight: minimumHeight
 
+    property int screen: plasmoid.containment.screen
+
     readonly property bool inEditMode: latteInEditMode || plasmoid.userConfiguring
 
     readonly property bool mustHide: {
@@ -77,6 +79,7 @@ PlasmoidItem {
 
     readonly property int containmentType: plasmoid.configuration.containmentType
     readonly property int visibility: plasmoid.configuration.visibility
+    readonly property bool perScreenActive: plasmoid.configuration.perScreenActive
 
     readonly property int minimumWidth: {
         if (plasmoid.formFactor === PlasmaCore.Types.Horizontal) {