[bug #60611] [man] vertical spacing glitches when continuous rendering plus batch processing

[G. Branden Robinson]

Update of bug #60611 (project groff):

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

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Follow-up Comment #1:


commit ef2bca1e2f11e1d12fd5559edb39953550d4fa4c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu May 20 00:55:11 2021 +1000

    [man]: Fix other half of Savannah #60611.
    
    * tmac/an-old.tmac (an-bp): In continuous rendering mode, draw a
      horizontal line between a page footer of one man page document and the
      beginning of the next, but only if multiple documents are beign
      rendered.
    
      (initialization): Use variable to ensure we don't draw this line after
      finishing the only document we render.
    
    Fixes other half of <https://savannah.gnu.org/bugs/?60611>.

commit f6f1218b0408233124b7b63cd53aa529659e0901
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu May 20 00:50:01 2021 +1000

    [man]: Fix half of Savannah #60611.
    
    Fix stochastic vertical space loss problems in continuous rendering mode
    by being more scrupulous about extending the page length.  As noted in
    Savannah #60611, sometimes the vertical space between a header line and
    the first section heading ("Name") would be reduced or removed
    altogether, in a way that was highly sensitive to circumstances.  As far
    as I can tell, the problem is that this vertical space disappeared only
    when we were in double-secret probation no-space mode; this is the
    special non-spacing mode (not apparent with inspection of \n[.ns]) that
    happens when the internal stealth vertical position trap is sprung.
    This trap does not appear in .ptr output but can be disabled with ".vpt
    0", which is an alternative fix for this problem (because continuous
    rendering mode does not use vertical position traps at all).  Another
    fix might have been to simply call the moral equivalent of ".pl MAXINT"
    as soon as continuous rendering mode was decided upon.
    
    * tmac/an-old.tmac (an-header): In continuous rendering mode, extend the
      page length by one line before calling PT to output the page header,
      and afterwards, extend the page length by 3 vees and space by that
      amount (instead of half an inch).
    
    Fixes half of <https://savannah.gnu.org/bugs/?60611>.


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