title: how to make Google Map info windows immediately show after load the map in Flutter?
body: <p>I can show Google Map on my Flutter app by using the code below</p>
  <pre><code>        final marker = Marker(
            markerId: MarkerId(&quot;someID&quot;),
            position: LatLng(0.0, 0.0),
            infoWindow: InfoWindow(title: &quot;Venue Name&quot;),
          );
  
           GoogleMap(
              onTap: (newCoordinate) =&gt; onMapTapped(newCoordinate, controller),
              mapType: MapType.normal,
              onMapCreated: onGoogleMapCreated,
              initialCameraPosition: CameraPosition(
                target: LatLng(0.0, 0,0),
                zoom: 15.0,
              ),
              markers: {marker},
            ),
  </code></pre>
  <p>to show the info window, I need to tap that red marker first. what I want is ....</p>
  <p>whenever the map load in the screen, that info window will immediately open without I need to tap the red marker. so I can show that &quot;Venue Name&quot; . how to do that?</p>