[HarfBuzz] Streamlining hb_font_t some more

[Behdad Esfahbod]

On 15-10-26 08:41 AM, Werner LEMBERG wrote:
>>> Knuth knew *very well* what he was doing, and the TeX typesetting
>>> >> model works just fine for almost all cases, even more than 30 years
>>> >> later.
>> > 
>> > That is such a big claim, judging by the amount of people strugling with
>> > TeX line spacing on tex.stackexchange.com:
>> > http://tex.stackexchange.com/questions/tagged/line-spacing
> Hehe :-) Actually, I've meant the simple idea of using glyph boxes
> glued together to form a line, where lines normally have a fixed
> baseline-to-baseline distance.

But that's exactly what TeX isn't...  Anyway, I'll follow up in other messages.