[bug #61070] [troff] want to drop default "User Abort." text from .ab request

[G. Branden Robinson]

Update of bug #61070 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #7:


commit e266961202e32db22a94fa15ababddfc12771166
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Sep 7 07:16:20 2021 +1000

    [troff]: Quieten `.ab` if given no arguments.
    
    [troff]: Make `ab` request quiet if given no arguments.  The `tm`, and
    `tm1` and `tmc` requests provide ample flexibility for constructing
    diagnostic messages prior to an error exit, and it's convenient to make
    `ab` itself quiet instead of saying "User Abort." as Unix Version 7
    troff did.  Further, there is no standardization across troffs regarding
    what `ab` should emit if arguments are absent.
    
    * src/roff/troff/input.cpp (abort_request): Do it.
    
    * src/roff/groff/tests/ab_works.sh:
    * src/roff/groff/groff.am (groff_TESTS): Test it.
    
    * doc/groff.texi (Debugging, Implementation Differences):
    * man/groff.7.man (Requests/Request short reference):
    * man/groff_diff.7.man (Implementation differences): Document it.
    
    Fixes <https://savannah.gnu.org/bugs/?61070>.  Thanks to Dave Kemper for
    the discussion.


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