[bug #66054] [troff] permit special characters as source hyphenation codes

[G. Branden Robinson]

Update of bug #66054 (group groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #1:


commit 0537db320edc83daa3ad3ed539e3ce524f366169
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Aug 1 18:07:35 2024 -0500

    Regression-test Savannah #66054.
    
    * src/roff/groff/tests/hcode-request-copies-spec-char-code.sh: Do it.
    * src/roff/groff/groff.am (groff_TESTS): Run test.
    
    Test fails at this commit.

commit f66f771c22690f5f0e6dec3c9a53adb7243bb7fe
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Aug 1 18:16:19 2024 -0500

    [troff]: Fix Savannah #66054 (hcode & spec chars).
    
    * src/roff/troff/input.cpp (set_hyphenation_codes): Accept a special
      character as a source for hyphenation code assignment.
    
    * doc/groff.texi.in (Manipulating Hyphenation) <hcode>:
    * man/groff_diff.7.man (New requests) <hcode>: Document loosened
      restriction.
    
    Fixes <https://savannah.gnu.org/bugs/?66054>.  Thanks to Carsten Kunze
    for the report and Dave Kemper for a test case that clarified matters.




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