abilities: drop parabolic.lastindex property

--new approach is much cleaner to use

containment/package/contents/ui/VisibilityManager.qml

@@ -81,8 +81,10 @@ Item{
     //! when Latte behaves as Plasma panel
     property int thicknessAsPanel: metrics.totals.thickness
 
+    readonly property bool appletIsDragged: root.dragOverlay && root.dragOverlay.pressed
+    property int appletsTrackingWindowsCount: 0
 
-    property Item applets: null
+    property Item layouts: null
 
     Binding{
         target: latteView
@@ -311,7 +313,7 @@ Item{
                 && !(latteView.visibility.mode === LatteCore.Types.AlwaysVisible /* Visibility */
                      || latteView.visibility.mode === LatteCore.Types.WindowsGoBelow
                      || latteView.visibility.mode === LatteCore.Types.AutoHide))
-               || applets.require.windowsTrackingCount > 0                   /*Applets Need Windows Tracking */
+               || appletsTrackingWindowsCount > 0                            /*Applets Need Windows Tracking */
                || root.dragActiveWindowEnabled                               /*Dragging Active Window(Empty Areas)*/
                || ((root.backgroundOnlyOnMaximized                           /*Dynamic Background */
                     || plasmoid.configuration.solidBackgroundForMaximized
@@ -321,6 +323,38 @@ Item{
                    && plasmoid.configuration.hideFloatingGapForMaximized)
     }
 
+    //! Local Bindings
+    Binding{
+        target: manager
+        property: "appletsTrackingWindowsCount"
+        when: !appletIsDragged
+        value: {
+            var cnts = 0;
+            var grid;
+
+            for (var l=0; l<=2; ++l) {
+                if (l===0) {
+                    grid = layouts.startLayout;
+                } else if (l===1) {
+                    grid = layouts.mainLayout;
+                } else if (l===2) {
+                    grid = layouts.endLayout;
+                }
+
+                for (var i=0; i<grid.children.length; ++i){
+                    var appletItem = grid.children[i];
+                    if (appletItem
+                            && appletItem.communicator
+                            && appletItem.communicator.requires.windowsTrackingEnabled) {
+                        cnts = cnts + 1;
+                    }
+                }
+            }
+
+            return cnts;
+        }
+    }
+
     Connections{
         target: background.totals
         onVisualLengthChanged: updateMaskArea();

containment/package/contents/ui/debugger/DebugWindow.qml

@@ -821,7 +821,7 @@ Window{
             }
 
             Text{
-                text: layoutsContainer.applets.require.windowsTrackingCount
+                text: visibilityManager.appletsTrackingWindowsCount
             }
 
             Text{

containment/package/contents/ui/main.qml

@@ -1242,7 +1242,7 @@ Item {
 
     VisibilityManager{
         id: visibilityManager
-        applets: layoutsContainer.applets
+        layouts: layoutsContainer
     }
 
     DragDropArea {

declarativeimports/abilities/client/ParabolicEffect.qml

@@ -34,12 +34,10 @@ AbilityDefinition.ParabolicEffect {
     //! private properties can not go to definition because can not be made readonly in there
     //! special care must be taken in order to be redefined in local properties
     readonly property bool directRenderingEnabled: ref.parabolic._privates.directRenderingEnabled
-    readonly property int lastIndex: local._privates.lastIndex /*special property that needs to remain the same*/
 
     readonly property AbilityDefinition.ParabolicEffect local: AbilityDefinition.ParabolicEffect {
         id: _localref
         readonly property bool directRenderingEnabled: _localref._privates.directRenderingEnabled
-        readonly property int lastIndex: _localref._privates.lastIndex
     }
 
     Item {

declarativeimports/abilities/definition/ParabolicEffect.qml

@@ -32,7 +32,6 @@ Item {
 
     readonly property ParabolicEffectTypes.PrivateProperties _privates: ParabolicEffectTypes.PrivateProperties {
         directRenderingEnabled: false
-        lastIndex: -1
     }
 
     property Item currentParabolicItem: null

declarativeimports/abilities/definition/paraboliceffect/PrivateProperties.qml

@@ -21,5 +21,4 @@ import QtQuick 2.7
 
 Item {
     property bool directRenderingEnabled: false
-    property int lastIndex: -1
 }

declarativeimports/abilities/host/ParabolicEffect.qml

@@ -25,7 +25,6 @@ AbilityDefinition.ParabolicEffect {
     id: apis
 
     readonly property bool directRenderingEnabled: _privates.directRenderingEnabled
-    readonly property int lastIndex: _privates.lastIndex
 
     //! This needs to be rethought and rechecked in order for public api to provide
     //! functionality that functionality must already exist in the definition
@@ -33,7 +32,6 @@ AbilityDefinition.ParabolicEffect {
         readonly property alias isEnabled: apis.isEnabled
         readonly property alias directRenderingEnabled: apis.directRenderingEnabled
         readonly property alias factor: apis.factor
-        readonly property alias lastIndex: apis.lastIndex
         readonly property alias restoreZoomIsBlocked: apis.restoreZoomIsBlocked
         readonly property alias currentParabolicItem: apis.currentParabolicItem