[bug #65693] exceptions to NBSP statement in groff_char(7) should be documented

[Dave]

URL:
  <https://savannah.gnu.org/bugs/?65693>

                 Summary: exceptions to NBSP statement in groff_char(7) should
be documented
                   Group: GNU roff
               Submitter: barx
               Submitted: Mon 06 May 2024 02:06:11 AM CDT
                Category: Core
                Severity: 2 - Minor
              Item Group: Documentation
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Mon 06 May 2024 02:06:11 AM CDT By: Dave <barx>
groff_char(7) states, "a no-break space... is mapped to \~, the adjustable
non-breaking space escape sequence."

But as Deri and Bjarni point out in bug #62300, some fonts (including many URW
fonts groff installs for devpdf) include a u00A0 glyph, which is necessarily
of a fixed width.

Demonstration (when using -Tpdf):

.ft U-TR
a b c
.brp
a b\~c
.brp
a b\[u00A0]c
.brp

The results are the same if "\[u00A0]" is replaced with the corresponding
Latin-1 character.







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