calculate scrolling length in (int) values

--calculations for tasks length exceed must be done
always in same arthmetic world either int or float for
all values. It is chosen the int case because latte
is providing applets length in int values

BUG:439540

plasmoid/package/contents/ui/task/TaskMouseArea.qml

@@ -211,7 +211,7 @@ MouseArea {
     }
 
     onWheel: {
-        var wheelActionsEnabled = (root.taskScrollAction !== LatteTasks.Types.ScrollNone || manualScrollTasksEnabled);
+        var wheelActionsEnabled = (root.taskScrollAction !== LatteTasks.Types.ScrollNone || root.manualScrollTasksEnabled);
 
         if (isSeparator
                 || wheelIsBlocked

plasmoid/package/contents/ui/taskslayout/ScrollableList.qml

@@ -27,7 +27,8 @@ Flickable{
     readonly property bool centered: root.alignment === LatteCore.Types.Center
     readonly property bool reversed: Qt.application.layoutDirection === Qt.RightToLeft
 
-    readonly property bool contentsExceed: root.scrollingEnabled ? root.tasksLength > flickableContainer.length : false
+    //! Math.floor is needed in order to make calculations in (int) world
+    readonly property bool contentsExceed: root.scrollingEnabled ? Math.floor(root.tasksLength) > flickableContainer.length : false
     readonly property int contentsExtraSpace: contentsExceed ? root.tasksLength - flickableContainer.length : 0
 
     readonly property real scrollFirstPos: 0