delayer for tasks wheel events

-- touchpads and fast wheel scrolling for
tasks was creating an unpredicted effect
from user point view. The solution was
already tested from audio badges, applets
wheel activation but hadnt got into
for Tasks.

BUG: 396737
FIXED-IN: 0.8.1

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

@@ -88,6 +88,7 @@ MouseArea{
     // hoverEnabled: false
     //opacity : isSeparator && (hiddenSpacerLeft.neighbourSeparator || hiddenSpacerRight.neighbourSeparator) ? 0 : 1
 
+    property bool blockWheel: false
     property bool buffersAreReady: false
     property bool delayingRemove: ListView.delayRemove
     property bool scalesUpdatedOnce: false
@@ -863,13 +864,16 @@ MouseArea{
     }
 
     onWheel: {
-        if (isSeparator || !root.mouseWheelActions || inWheelAction || inBouncingAnimation
+        if (isSeparator || !root.mouseWheelActions || blockWheel || inWheelAction || inBouncingAnimation
                 || (latteDock && (latteDock.dockIsHidden || latteDock.inSlidingIn || latteDock.inSlidingOut))){
             return;
         }
 
         var angle = wheel.angleDelta.y / 8;
 
+        blockWheel = true;
+        scrollDelayer.start();
+
         //positive direction
         if (angle > 12) {
             if (isLauncher || root.disableAllWindowsFunctionality) {
@@ -908,6 +912,18 @@ MouseArea{
         }
     }
 
+    //! A timer is needed in order to handle also touchpads that probably
+    //! send too many signals very fast. This way the signals per sec are limited.
+    //! The user needs to have a steady normal scroll in order to not
+    //! notice a annoying delay
+    Timer{
+        id: scrollDelayer
+
+        interval: 400
+
+        onTriggered: mainItemContainer.blockWheel = false;
+    }
+
     ///////////////// End Of Mouse Area Events ///////////////////
 
     ///// Handlers for Signals /////