pinchZoomThreshold property
Pinch Zoom threshold default is 0.5 Map starts to zoom when
pinchZoomThreshold has been achieved or another multi finger gesture
wins which allows MultiFingerGesture.pinchZoom Note: if
MapOptions.interactiveFlags.flags
doesn't contain
InteractiveFlag.pinchZoom or enableMultiFingerGestureRace is false
then zoom cannot win.
Implementation
final double pinchZoomThreshold;