[bug #58500] default value for second parameter to .ss should follow modern typographic convention

[Dave]

URL:
  <https://savannah.gnu.org/bugs/?58500>

                 Summary: default value for second parameter to .ss should
follow modern typographic convention
                 Project: GNU troff
            Submitted by: barx
            Submitted on: Thu 04 Jun 2020 11:23:42 PM CDT
                Category: Core
                Severity: 3 - Normal
              Item Group: New feature
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

As mentioned in passing in bug #58450, typographic convention of the last
70-100 years has been to use the same amount of space between sentences as
between words.

groff allows the user to specify any amount, including none, of additional
inter-sentence space to add.  This flexibility is good.

However, by default, groff should follow modern typographic convention.  This
would require the default value of sentence_space_size (register \n[.sss]) be
0.  Instead, currently:

* If a document never calls the .ss request, groff defaults to a value of 12
for word_space_size and 12 for sentence_space_size.
* If a document calls the .ss request but with only one argument
(word_space_size), groff sets sentence_space_size to be equal to
word_space_size.

In both these cases, the default sentence_space_size should be 0.




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