remove some deprecated paraboliceffect apis

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

@@ -28,7 +28,7 @@ Item{
     width: root.vertical ? wrapper.width : nHiddenSize
     height: root.vertical ? nHiddenSize : wrapper.height
 
-    visible: (rightSpacer ? index === parabolicManager.lastRealTaskIndex : index === parabolicManager.firstRealTaskIndex)
+    visible: (rightSpacer ? index === taskItem.indexer.lastVisibleItemIndex : index === taskItem.indexer.firstVisibleItemIndex)
              || (separatorSpace > 0) || taskItem.inAttentionAnimation
              || taskItem.inFastRestoreAnimation || taskItem.inMimicParabolicAnimation
 

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

@@ -62,7 +62,7 @@ Item {
             maximumWidth: {
                 if (showsAudioBadge) {
                     return height;
-                } else if ( index === parabolicManager.firstRealTaskIndex && !taskItem.containsMouse) {
+                } else if ( index === taskItem.indexer.firstVisibleItemIndex && !taskItem.containsMouse) {
                     return (wrapper.mScale * (taskItem.metrics.iconSize - (root.enableShadows ? shadowSize/2 : 0)));
                 } else {
                     return 999999;

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

@@ -584,14 +584,6 @@ MouseArea{
         }
     }
 
-    onLastValidIndexChanged: {
-        if (lastValidIndex>=0 && lastValidIndex<root.tasksCount){
-            if (!isForcedHidden && (lastValidIndex < parabolicManager.firstRealTaskIndex || lastValidIndex > parabolicManager.lastRealTaskIndex)) {
-                parabolicManager.updateTasksEdgesIndexes();
-            }
-        }
-    }
-
     onIsDraggedChanged: {
         if(isDragged && (!root.inConfigureAppletsMode)){
             root.dragSource = taskItem;

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

@@ -166,13 +166,13 @@ Item{
             var scales = taskItem.parabolic.applyParabolicEffect(index, currentMousePosition, center);
 
             //Left hiddenSpacer for first task
-            if(((index === parabolicManager.firstRealTaskIndex )&&(root.tasksCount>0)) && !root.disableLeftSpacer
+            if(((index === taskItem.indexer.firstVisibleItemIndex)&&(root.tasksCount>0)) && !root.disableLeftSpacer
                     && !inMimicParabolicAnimation && !inFastRestoreAnimation && !inAttentionAnimation){
                 hiddenSpacerLeft.nScale = scales.leftScale - 1;
             }
 
             //Right hiddenSpacer for last task
-            if(((index === parabolicManager.lastRealTaskIndex )&&(root.tasksCount>0)) && !root.disableRightSpacer
+            if(((index === taskItem.indexer.lastVisibleItemIndex )&&(root.tasksCount>0)) && !root.disableRightSpacer
                     && !inMimicParabolicAnimation && !inFastRestoreAnimation && !inAttentionAnimation){
                 hiddenSpacerRight.nScale =  scales.rightScale - 1;
             }

plasmoid/package/contents/ui/task/animations/RealRemovalAnimation.qml

@@ -68,9 +68,6 @@ SequentialAnimation {
                 //! the removal animation a small margin must applied
                 var spacer = taskItem.headItemIsSeparator ? -(2+taskItem.metrics.totals.lengthEdge) : ( taskItem.headItemIsSeparator ? (2+taskItem.metrics.totals.lengthEdge)/2 : 0);
 
-                //console.log("EDGES ::: " + parabolicManager.firstRealTaskIndex + " _ " + parabolicManager.lastRealTaskIndex);
-                //console.log("Removing ::: " + lastValidIndex + " _ " + launcherUrl + " _ " + previousTaskIsSeparator + " _ " + nextTaskIsSeparator);
-
                 if (root.vertical) {
                     taskItem.anchors.top = previousTask.bottom;
                     taskItem.anchors.topMargin = spacer;

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

@@ -169,7 +169,7 @@ Flickable{
         var block = !root.autoScrollTasksEnabled && !duringDragging;
 
         if (block || !contentsExceed || root.tasksCount < 3
-                || (task.itemIndex===parabolicManager.lastRealTaskIndex && parabolic.factor.zoom>1)) {
+                || (task.itemIndex===task.indexer.lastVisibleItemIndex && parabolic.factor.zoom>1)) {
             //last task with parabolic effect breaks the autoscolling behavior
             return;
         }