[bug #54473] [hdtbl] want examples to be `-ww`-clean

[G. Branden Robinson]

Update of bug #54473 (group groff):

                 Summary: chess_board.roff: Many registers are not defined =>
[hdtbl] want examples to be `-ww`-clean

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Follow-up Comment #4:


commit d82af36a7b86f2a92d178801f25a3921f661a839
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Nov 20 21:45:20 2024 -0600

    [hdtbl]: Make `-wall` clean.
    
    * contrib/hdtbl/hdmisc.tmac (t*index): Fix "range" warning: clamp
      substring extraction at length of string.
    
      (t*DI): Fix "tab" warnings: precede tab characters in macro calls with
      comment character.
    
    * contrib/hdtbl/hdtbl.tmac (ETC): Fix "range" warning: clamp line length
      at horizontal motion quantum the desired value is less.
    
    * contrib/hdtbl/hdtbl.am (HDTBLGROFF): Run groff with `-b` and `-wall`
      options.
    
    * contrib/hdtbl/examples/color_transitions.roff (ctab): When
      incrementing color channel value, cap it at "1f" to avoid "range"
      warning.
    
    * contrib/hdtbl/examples/common.roff (d2x): Fix "range" warning: clamp
      substring extraction at length of string.


I have no plans to go further at this time.


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