PinchHandler with disabled axes drags its target the opposite direction

You can reproduce this with the map.qml manual test.

1. PinchHandler has xAxis.enabled: false and yAxis.enabled: false
2. place fingers close together when beginning the gesture
3. expand the pinch vertically to zoom in to a point on the map
4. drag fingers horizontally while expanded: the map should not move side to side, because the xAxis is disabled; but in fact it does, and the more you have zoomed in, the more this sideways motion is "amplified". If you draghorizontally, the target moves to the left instead, and vice-versa.