TinyMap Scene Coordinates Fix

[Spirited]

Thread just to document a fix, result of a private conversation.

private void CombineScene(Scene s, UInt16 locX, UInt16 locY)
{
    foreach (ScenePart part in s.Parts)
    {
        for (int y = 0; y < part.Size.Height; y++)
        {
            for (int x = 0; x < part.Size.Width; x++)
            {
                Int32 X = locX + part.Start.X - x;
                Int32 Y = locY + part.Start.Y - y;
                SetValid(X, Y, part.Valid[x, y]);
            }
        }
    }
}