[Dev-luatex] lualatex (incorrectly) replaces em dashes with hyphens

Arthur Reutenauer arthur.reutenauer at normalesup.org
Fri Mar 1 14:14:36 CET 2019

On Thu, Feb 28, 2019 at 11:57:01AM +0100, Frank Mittelbach wrote:
> true, but it is also correct that in the last 3 decades essentially any font
> usable with TeX (well LaTeX) had the ligatures, so the statement in the TeX
> book that --- is the way to get an emdash was/is true with virtually all
> fonts in use in pdftex. So it is not just a quirk of CM fonts, it is largely
> a feature of the ecosystem (or was in the days of Type 1 fonts) and as such
> it is a pity imho if it becomes a breaking change when processing a document
> with a unicode engine.

  But the engines didn’t change at all in that respect: the actual
change that XeTeX and LuaTeX brought is that all of a sudden it became
possible to use many more fonts than before, most of which didn’t have
the ligatures that TeX users had come to expect.


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