[HarfBuzz] Zero-width joiner has width

[Behdad Esfahbod]

On 15-08-09 10:15 AM, Simon Cozens wrote:
> {
>   {
>     codepoint = 77,
>     depth = 0,
>     height = 4.6875,
>     name = "m",
>     x_advance = 514,
>   },
> }
> 
> Should be 1645, right? I am not sure where 514 is coming from.

So what was the problem?