[HarfBuzz] `hb-view --line-space=100` does not show all the lines

[Behdad Esfahbod]

Fixed.

On 09/19/11 17:53, Khaled Hosny wrote:
> Hi all,
> 
> It seems the overall image height does not take into account the value
> of --line-space into account, causing some bottom lines not to be shown.
> 
> Regards,
>  Khaled
>