Google Map route dragging becomes unstable when suppressMarkers is set to true

问题

I have a Google Map where I can add multiple points/stops(waypoints) between source and destination route.

After the route is created (google.maps.DirectionsService) and put on the map (google.maps.DirectionsRenderer), you can drag the route middle-points to adjust the route as you wish -- draggable=true is set in the constructor of DirectionsRenderer.

   directionsDisplay = new google.maps.DirectionsRenderer({
    suppressMarkers: true,
    draggable:true
});

The problem is when I change the route between two stops by dragging and later i again want to change the route by dragging same changed route point, it doesn't allow me.

But if I set suppressMarkers: false, then it works good. Since I have to place custom marker I cannot mark suppressMarkers to true.

Any help would be highly appreciated.

来源：https://stackoverflow.com/questions/45769485/google-map-route-dragging-becomes-unstable-when-suppressmarkers-is-set-to-true