Make PieMenu in pointer handlers example work with mouse right-click

It opens instantly with right-click; whereas it animates open with
a finger or stylus, to avoid accidental activation, as before.

Pick-to: 6.5
Change-Id: I6f530fb6da67c735fe3aae4545c8040f49e8dc05
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
(cherry picked from commit 86081091f9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 08b00cf7e3)

examples/quick/pointerhandlers/components/QuadPieMenu.qml

@@ -9,6 +9,7 @@ TapHandler {
     signal triggered(string text)
 
     id: menuTap
+    acceptedButtons: Qt.RightButton
     gesturePolicy: TapHandler.DragWithinBounds
     onPressedChanged: if (pressed) {
         impl.x = point.position.x - impl.width / 2
@@ -22,7 +23,10 @@ TapHandler {
         parent: menuTap.parent
         width: 100
         height: 100
-        scale: Math.min(1, Math.max(0, menuTap.timeHeld * 4))
+        // with touchscreen or stylus, long-press slowly expands the menu to size
+        // with mouse or touchpad right-click, it opens instantly
+        scale: menuTap.point.device.pointerType === PointerDevice.Generic ?
+                   1 : Math.min(1, Math.max(0, menuTap.timeHeld * 4))
         opacity: scale * 2
         visible: menuTap.pressed
         property Shape highlightedShape: null