On 2/5/2023 4:52 PM, Pablo Rodriguez via ntg-context wrote:
On 2/5/23 13:13, Hans Hagen via ntg-context wrote:
On 2/5/2023 12:32 PM, Pablo Rodriguez via ntg-context wrote:
[...]
Are we missing something or is this a bug?
what do you expect as result? (maybe try \righthyphenmin=1)

Line breaks are removing characters.

In the sample below, output from

   \hsize\zeropoint
   \sha{a1b2c3d4}

reads:

   a
  _
  _
  _
  _
   3d4

I’m afraid \righthyphenmin=-1 prevents hyphenation (it seems to do it
everywhere).
This

   \unexpanded\def\sha#1%
     {\begingroup
      \sethyphenationfeatures[sha]%
      \showglyphs
      \righthyphenmin1
      #1%
      \endgroup}

gives

a·
·
·
·
·
·
4


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