[XeTeX] Ligatures

[Arthur Reutenauer]

> Type1 smallcaps fonts used to do that, not sure why, but probably
> because some applications were doing ligature replacement incrementally
> and I think it propagated to some (early?) Adobe OpenType fonts. Also,
> some fonts seem to use such smallcap ligatures to fix bad interaction
> between ‘liga’ and ‘smcp’, but that is the wrong way to fix it.

  Interesting.  In any case, that should be considered a bug in the font
as you said.

	Arthur