[bug #64037] [mdoc] ensure long tables don't get blank lines in their midst when continuously rendering

[G. Branden Robinson]

Update of bug #64037 (project groff):

              Item Group:     Incorrect behaviour => Test                   
                 Summary: [mdoc] long tables get blank lines in their midst
when continuously rendering => [mdoc] ensure long tables don't get blank lines
in their midst when continuously rendering

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Follow-up Comment #2:

Affects groff 1.22.4.

I already fixed this, but had completely forgotten about it.


commit 1276643049b9e297651a1a6403f3463daa797713
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Jun 19 23:25:02 2021 +1000

    [mdoc]: Set usekeeps register used by tbl(1).
    
    * tmac/mdoc/doc-nroff-u: Set the usekeeps register used by tbl to the
      logical complement of the cR (continuous rendering) register.  This
      prevents blank lines from creeping into tables in that mode.
    
    Exposed by 971dc619 (earlier today).


But now I have a separate regression test for it, which will be handy if/when
we go ahead with the "\n[.R] = INT_MAX, .pl \n[.R]u" thing.


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