getCurrentWindow() for CastPlayer gives always 1

[mkaflowski]

When I use CastPlayer with multiple sources, seek track and the track finishes for every next track getCurrentWindow() gives 1.

I believe that remoteMediaClient.getMediaStatus().getIndexById() gives wrong results.
I can get the right result by:
Arrays.binarySearch(remoteMediaClient.getMediaQueue().getItemIds(),remoteMediaClient.getMediaStatus().getCurrentItemId() )

Changing the method fetchCurrentWindowIndex() works for me:

private int fetchCurrentWindowIndex(@Nullable MediaStatus mediaStatus) {
        Integer currentItemId = mediaStatus != null
                ? Arrays.binarySearch(remoteMediaClient.getMediaQueue().getItemIds(),remoteMediaClient.getMediaStatus().getCurrentItemId() ) : null;
        return currentItemId != null ? currentItemId : -1;
    }

It can be the bug in MediaStatus from com.google.android.gms.cast.

[AquilesCanta]

This is another manifestation of #4964. A fix will be referenced below this comment soon.

[AquilesCanta]

This should be fixed in the dev branch. Please try it out, and let me know if you encounter any issues.