[bug #60624] [man] unnecessarily breaks after short TP tag at page boundary

[G. Branden Robinson]

Update of bug #60624 (project groff):

                  Status:                    None => Fixed                  
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #1:


commit 4e1dbb55dc805d8eb5f5bcfa8ab8cbe1059cb7fd
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Jun 15 04:20:30 2021 +1000

    [man]: Fix Savannah #60624.
    
    [man]: Don't spuriously break a page after a paragraph tag when the tag
    is short enough to fit within the paragraph's indentation.
    
    * tmac/an-old.tmac (an-write-paragraph-tag): Reserve ("need") 2 vees
      plus 1 basic unit of vertical space regardless of the width of the
      tag.  In the short tag case, we reverse space by one vee after
      outputting the diversion in which the tag is stored, but it will
      always contain a break, and by the time we reverse, we might have
      already hit a page location trap (an-break-body-text), and by then
      it's too late to back up.
    
    Fixes <https://savannah.gnu.org/bugs/index.php?60624>.

commit 42ff1127bc4c1ea19482b7147f28238156e1269e
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Jun 15 04:00:38 2021 +1000

    Add regression test for Savannah #60624.
    
    * tmac/tests/an-old_no-break-after-short-paragraph-tags.sh: Test it.
    * tmac/tmac.am (tmac_TESTS): Run test.
    
    Test fails at this commit.


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