QQuickMultiPointTouchArea touch x,y properties are updated individually

QQuickMultiPointTouchArea updates the x and y properties in a naive way.

{{ dtp->setX(e->localPos().x());}}
{{ dtp->setY(e->localPos().y());}}

However when feeding these touch points into a canvas for drawing lines, what comes out are stair steps rather than lines because X and Y are reacted to separately.

The property changed updates should only be emitted after X and Y have been updated so that when the value is subsequently used, the canvas will draw a more appropriate motion.