[NTG-context] quote characters in luatex

[Hans Hagen]

Thomas A. Schmitz wrote:
> In my experiments with luatex, there's one thing that may be  
> surprising for many users: we have come to expect that the characters  
> ` and ' in our input files map to single left and single right  
> quotation marks. luatex just typesets them "verbatim," so to speak.  
> It converts the combination `` and '' to double quotation marks,  
> however. So my question: wouldn't it make sense to convert the single  
> marks as well? (And please don't tell me "Oh but you should use \quote 
> {} instead of ` '." I know that, but I guess that many users have  
> hundreds of old documents where they use `'. Moreover, ' also creates  
> the apostrophe character, which cannot be avoided.)

there is a feature:

texligatures=yes

for the rest, we can consider mappings but i fear that we end up in a 
quote mess

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