fix #351,use correct screenGeometry at task filter

--this fixes screen filtering for tasks but we
should investigate further in the future how
to support correct plasmoid.screenGeometry

containment/contents/ui/main.qml

@@ -192,6 +192,8 @@ DragDrop.DropArea {
     property int durationTime: plasmoid.configuration.durationTime
     property int latteAppletHoveredIndex: latteApplet ? latteApplet.hoveredIndex : -1
     property int tasksCount: latteApplet ? latteApplet.tasksCount : 0
+
+    property rect screenGeometry: dock ? dock.screenGeometry : plasmoid.screenGeometry
     ///END properties from latteApplet
 
     /* Layout.preferredWidth: plasmoid.immutable ?

plasmoid/contents/ui/main.qml

@@ -393,7 +393,7 @@ Item {
         id: tasksModel
 
         virtualDesktop: virtualDesktopInfo.currentDesktop
-        screenGeometry: plasmoid.screenGeometry
+        screenGeometry: latteDock ? latteDock.screenGeometry : plasmoid.screenGeometry
         // comment in order to support LTS Plasma 5.8
         // screen: plasmoid.screen
         activity: activityInfo.currentActivity