[NTG-context] Issue with grid

[Hans Hagen]

On 11/22/2020 5:03 PM, Joseph wrote:
> Dear list,
> 
> In some cases with latest LMTX I see text not aligned to grid. MWE 
> reproduces the problem (could not reproduce with default font).
> 
> Typesetting MWE using online ConTeXt page shows correctly aligned text 
> on grid.
> 
> \showgrid
> 
> \setuplayout[grid=both]
> 
> \definefontfeature[base][mode=node]
> 
> \definefontfamily[mainfont][serif][EBGaramond][features=base]
> 
> \setupbodyfont[mainfont, 9pt]
> 
> \starttext
> 
> \blank[line, samepage]Fin des psalmes.
> 
> \blank[line, samepage]Fin des psalmes.
> 
> \dorecurse{8}{\input knuth
> 
> }
> 
> \stoptext
> 
> If number of itérations is changed from 8 to 7) problem does not appear, 
> seems to be linked to the fact page is fully filled with lines.
> 
> If one of the \blank lines is commented out problem does not occur either.

It might have to do with the fact that the height/depth ratio that is 
used doesn't match well with the ascenders/descenders of the font that 
you use. The defaults are:

\setupinterlinespace
   [height=.72,
    depth=.28,
    line=2.8\exheight]

so you can play with these. The 72:28 ratio works ok for most fonts but 
sometimes need to be adapted. Sometimes the 2.8 is not enough.

(makes me wonder: i can issue a warning when a font can overrun)

(normally grid snapping should catch is but columns are kind of different)

Hans


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