parabolic:provide better rapid movement indicator

--each item is now informing Parabolic ability about its
visible index when the mouser enters first time its area.
This is enough for parabolic effect to identify correctly
when there is mouse rapid movement.

containment/package/contents/ui/abilities/privates/ParabolicEffectPrivate.qml

@@ -36,6 +36,8 @@ AbilityHost.ParabolicEffect {
 
     readonly property bool horizontal: plasmoid.formFactor === PlasmaCore.Types.Horizontal
 
+    property int lastParabolicItemIndex: -1
+
     Connections {
         target: parabolic
         onSglClearZoom: parabolic._privates.lastIndex = -1;
@@ -97,6 +99,18 @@ AbilityHost.ParabolicEffect {
         view.parabolic.currentItem = item;
     }
 
+    function setCurrentParabolicItemIndex(index) {
+        if (!directRenderingEnabled
+                && lastParabolicItemIndex > -1
+                && index > -1
+                && Math.abs(lastParabolicItemIndex-index) >=2 ) {
+            //! rapid movement
+            setDirectRenderingEnabled(true);
+        }
+
+        lastParabolicItemIndex = index;
+    }
+
     function applyParabolicEffect(index, currentMousePosition, center) {
         if (parabolic._privates.lastIndex === -1) {
             setDirectRenderingEnabled(false);
@@ -159,6 +173,7 @@ AbilityHost.ParabolicEffect {
                 return;
             }
 
+            parabolic.lastParabolicItemIndex = -1;
             parabolic.sglClearZoom();
 
             if (debug.timersEnabled) {

containment/package/contents/ui/applet/ParabolicArea.qml

@@ -43,6 +43,10 @@ Item {
 
         onEntered: {
             appletItem.parabolic.setCurrentParabolicItem(_parabolicArea);
+
+            var vIndex = appletItem.indexer.visibleIndex(index);
+            appletItem.parabolic.setCurrentParabolicItemIndex(vIndex);
+
             //! mouseX/Y can be trusted in that case in comparison to tasks that the relevant ParabolicAreaMouseArea does not
             _parabolicArea.parabolicEntered(mouseX, mouseY);
         }
@@ -83,12 +87,6 @@ Item {
             return;
         }
 
-        var rapidMovement = appletItem.parabolic.lastIndex>=0 && Math.abs(appletItem.parabolic.lastIndex-index)>1;
-
-        if (rapidMovement) {
-            parabolic.setDirectRenderingEnabled(true);
-        }
-
         if( ((wrapper.zoomScale === 1 || wrapper.zoomScale === appletItem.parabolic.factor.zoom) && !parabolic.directRenderingEnabled) || parabolic.directRenderingEnabled) {
             if (root.isHorizontal){
                 var step = Math.abs(appletItem.layouts.currentSpot-mouseX);

plasmoid/package/contents/ui/abilities/ParabolicEffect.qml

@@ -128,6 +128,12 @@ ClientAbility.ParabolicEffect {
         }
     }
 
+    function setCurrentParabolicItemIndex(index) {
+        if (bridge) {
+            bridge.parabolic.host.setCurrentParabolicItemIndex(index);
+        }
+    }
+
 
     function applyParabolicEffect(index, currentMousePosition, center) {
         if (parabolic.local._privates.lastIndex === -1) {

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

@@ -42,6 +42,10 @@ Item {
 
         onEntered: {
             taskItem.parabolic.setCurrentParabolicItem(_parabolicArea);
+
+            var vIndex = taskItem.shortcuts.shortcutIndex(taskItem.itemIndex);
+            taskItem.parabolic.setCurrentParabolicItemIndex(vIndex);
+
             // mouseX/Y can not be trusted at this point
             //_parabolicArea.parabolicEntered(mouseX, mouseY);
         }
@@ -88,12 +92,6 @@ Item {
         }
 
         if((inAnimation == false)&&(!root.taskInAnimation)&&(!root.disableRestoreZoom) && taskItem.hoverEnabled){
-            var rapidMovement = taskItem.parabolic.local.lastIndex>=0 && Math.abs(taskItem.parabolic.local.lastIndex-itemIndex)>1;
-
-            if (rapidMovement) {
-                taskItem.parabolic.setDirectRenderingEnabled(true);
-            }
-
             if( ((wrapper.mScale === 1 || wrapper.mScale === taskItem.parabolic.factor.zoom) && !taskItem.parabolic.directRenderingEnabled)
                     || taskItem.parabolic.directRenderingEnabled || !taskItem.scalesUpdatedOnce) {
                 if(root.dragSource == null){