[bug #64937] [troff] officially support composite character unmapping

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?64937>

                 Summary: [troff] officially support composite character
unmapping
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Wed 29 Nov 2023 01:07:26 AM UTC
                Category: Core
                Severity: 1 - Wish
              Item Group: Warning/Suspicious behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 29 Nov 2023 01:07:26 AM UTC By: G. Branden Robinson <gbranden>
You can set up composite character mappings.

The stock file _composite.tmac_ does so.

But can you _unmap_ or cancel these mappings?

It turns out, yes.

Observe:


$ nl ATTIC/composite-unmap.groff
     1  .nf
     2  \[a $] \" not a defined composite character combination; no warning
     3  \[a aa]
     4  .composite aa \" will warn with -ww, but _does_ undo the mapping
     5  \[a aa]
     6  .pl \n[nl]u
$ nroff -ww ATTIC/composite-unmap.groff
troff:ATTIC/composite-unmap.groff:4: warning: missing identifier
a
á
a


So all we really need to do is remove the diagnostic message and document the
behavior.







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