Auto-opened info window in a Google v3 cluster is not properly centered

```
Geo Mashup 1.8.2
Google Maps API v3

If the automatically opened marker happens to be in a cluster, the info window 
opens in the upper left and may be sized incorrectly.
```

Original issue reported on code.google.com by `dylankk...@gmail.com` on 4 Dec 2014 at 7:27
