> josephcanedo@gmail.com <mailto:josephcanedo@gmail.com>
> 20. Juli 2016 um 20:48
> I think I could figure out the reason of this problem. Actually 
> emergency stretch is broken in all cases it seems. In luatex source 
> code I see:
>
> source/texk/web2c/luatexdir/tex/commands.w:    
> primitive_tex("emergencystretch",
>  assign_dimen_cmd, *dimen_base *+ emergency_stretch_code, dimen_base);
>
> source/texk/web2c/luatexdir/tex/equivalents.h:#define 
> emergency_stretch_par
> *glue_par*(emergency_stretch_code)
>
> source/texk/web2c/luatexdir/tex/equivalents.h:#  define glue_par(A)  
> equiv(*glue_base*+(A))
>
> I could be wrong but to me it seems we assign some value to emergency 
> stretch “variable” setting using “emergencystretch” command and we use 
> another via emergency_stretch_par.
>
> Unfortunately I am not able to build luatex locally on Windows 
> Platform, only sync code from SVN repository.
This produces three different paragraphs.

\setupwhitespace[line]

\starttext

\input tufte

\startalignment[stretch]
\input tufte
\stopalignment

\startalignment[extremestretch]
\input tufte
\stopalignment

\stoptext

Wolfgang