fix markers rerender when click to open InfoWindow

[deadkff01]

Solving issue #269

In Marker.js componentDidUpdate()

this.props.position and prevProps.position will never be equal after component is fully rendered in first time, because these properties are objects, for this reason I use the lat and lng to compare after the first rendering.

[m-bartenev]

@deadkff01 , I came across that issue recently. I did the same comparison but in shouldComponentUpdate method. Can I ask you why you've opted to the componentDidUpdate? Thanks

[deadkff01]

@m-bartenev, I did the comparison in componentDidUpdate only to keep the same code structure. :)

[m-bartenev]

@deadkff01 , I see :) Thank you for your answer!

[srobertson421]

To anyone who comes across this bug, here is a patch you can use until things are merged, should stop the constant re-renders:

class CustomMarker extends Marker {
  componentDidUpdate(prevProps) {
    if(
      this.props.map !== prevProps.map || 
      this.props.icon.url !== prevProps.icon.url || 
      (
        this.props.position.lat !== prevProps.position.lat || 
        this.props.position.lng !== prevProps.position.lng
      )
    ) {
      if(this.marker) {
        this.marker.setMap(null);
      }
      this.renderMarker();
    }
  }
}

[deadkff01]

Nice @srobertson421