[bug #64233] [troff] make requests' treatment of Boolean arguments more consistent

[G. Branden Robinson]

Update of bug#64233 (group groff):

                Severity:              3 - Normal => 1 - Wish               
              Item Group: Warning/Suspicious behaviour => Feature change      
  
                  Status:                    None => Fixed                  
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #1:

"I was back at the flat so quick that I nearly met myself coming out." — P.
G. Wodehouse

In _groff_ development, I suppose, 9 months is speedy.

(The truth is, I'd forgotten I filed this.)


commit d592ab9e3d3f9efeacece25ed8b03676031bd02e
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Feb 11 10:21:25 2024 -0600

    [troff]: Alter color, cp, linetabs, vpt requests.
    
    [troff]: The `color`, `cp`, `linetabs`, and `vpt` requests now interpret
    arguments with negative values as instructions to disable the
    corresponding feature, using the *roff integer-to-Boolean conversion
    idiom instead of the C/C++ one.  Thus, if you invoke these requests with
    a register interpolation, the outcome agrees with an `if` test of the
    register's value.
    
    * src/roff/troff/div.cpp (vertical_position_traps):
    * src/roff/troff/env.cpp (widow_control_request) [WIDOW_CONTROL]
      (line_tabs_request):
    * src/roff/troff/input.cpp (activate_color, compatible): Do it.
    
    * doc/groff.texi.in (Tabs and Fields, Colors, Vertical Position Traps)
      (Compatibility Mode):
    * man/groff.7.man (Syntax reference conventions)
      (Request short reference):
    * man/groff_diff.7.man (New requests): Document it.




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