[bug #57665] tbl: want better TTY support for extremely long tables

[G. Branden Robinson]

Update of bug #57665 (project groff):

                Severity:                1 - Wish => 2 - Minor              
              Item Group:             New feature => Incorrect behaviour    
                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.22.5                 

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Follow-up Comment #6:


commit ffef301cb320f13292f20d53f4fd2a52a5e70a47
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Oct 9 19:57:43 2020 +1100

    Fix man(7) continuous rendering/tbl interaction.
    
    Stop tbl from injecting spurious blank lines (and emitting spurious
    warnings about tables and "text blocks" not "fitting on a page") into
    long tables in man pages when continuous rendering is used (the default
    for nroff output devices).
    
    * src/preproc/tbl/table.cpp (USE_KEEPS_REG): New preprocessor symbol
      stores name of groff register for dynamic determination of keep usage.
    
      (table::init_output): If the NOKEEP flag is not set, then in generated
      groff output, see if the usekeeps register is defined; if not, define
      it and enable usage of keeps.
    
      (table::do_row): In groff output, check usekeeps register before
      calling keep and release macros.
    
      (table::do_bottom): In groff output, check usekeeps register before
      calling release macro.
    
    * tmac/an-old.tmac (TS): Set the usekeeps register used by tbl to the
      logical complement of the man(7) cR (continuous rendering) register.
    
    Problem appears to date back to the introduction of continuous
    rendering in groff 1.17 (3 May 2001).


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