[bug #64958] [troff] accept `hla` without argument to unset hyphenation language

[G. Branden Robinson]

Update of bug#64958 (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 b6032814bb8341fa14756f7de1df0f3590903acf
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Dec 27 19:22:13 2023 -0600

    [troff]: Accept `hla` request without arguments.
    
    [troff]: Add another explicit mechanism for disabling hyphenation;
    accept an `hla` request without arguments for this purpose.
    
    * src/roff/troff/env.cpp (select_hyphenation_language): Do it.
    
    * doc/groff.texi (Manipulating Hyphenation):
    * man/groff.7.man (Request short reference):
    * man/groff_diff.7.man (New requests):
    * NEWS: Document it.
    
    * src/roff/groff/tests/hla-request-works.sh: Test it.
    * src/roff/groff/groff.am (groff_TESTS): Run test.
    
    Fixes https://savannah.gnu.org/bugs/?64958>.




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