[NTG-context] copyfont and font features

Ulrike Fischer news3 at nililand.de
Thu Nov 17 15:05:55 CET 2016

Am Thu, 17 Nov 2016 13:07:22 +0100 schrieb Hans Hagen:

>> Simply using \let doesn't work when you want locally a different
>> expansion behaviour:
>>    ! error:  (font expansion): font has been expanded with different
>> stretch limit.
>> (with pdflatex + lualatex), that's imho the reason why microtype
>> copies the fonts.
> in fact that is also the case with pdftex: afaik expansion and 
> protrusion values are global and once a font is used they get frozen

Yes, exactly. 

> in luatex (at least the lua font loader) one can set the expansion at 
> definition time (which is more natural but not possible in pdftex)

Yes, but I understand that -- if possible -- microtype prefers code
that works in pdftex *and* luatex.  

>> The question is if microtype can easily retrieve the current font
>> features and if it will slow down the code much if it has to
>> redefine fonts again and again.
> that's a matter of implementation

Yes, the maintainer of microtype has been informed about the problem
and can now look for a solution ...

Ulrike Fischer 

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