[luatex] package csquotes

[Joseph Wright]

On 14/07/2016 14:44, Herbert Voss wrote:
>> !` is a ligature in tex and gives (also with pdflatex) the upside
>> down exclamation mark. !{}` avoids the ligature in pdflatex but (no
>> longer) in luatex. The \enquote obviously expands to ! + ` and then
>> the ligature is built.
> 
> I know all that and it was not my problem. I asked for the different
> behaviour xelatex<->lualatex

LuaTeX explicitly alters behaviour in this area, and "{}" will therefore
never suppress a ligature, whilst with TeX90 it often will.

Joseph