[bug #61348] [troff] assertion in env.cpp:distribute_space() has to come out

[G. Branden Robinson]

Update of bug #61348 (project groff):

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

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Follow-up Comment #2:


commit 45293d589293cf4d938aebdd4812926956ec36ea
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Oct 19 13:30:29 2021 +1100

    Fix Savannah #61348.
    
    * src/roff/troff/env.cpp (distribute_space): Revert an `assert()` I
      added in commit b93eacd8d7 (5 September); we can indeed reach this
      code with a negative amount of desired space, and in fact the "show
      hyphenation points" trick
      <https://froude.eu/groff/examples/hyphenation-points.html> relies upon
      it.  Add explanatory comment.
    
    Fixes <https://savannah.gnu.org/bugs/?61348>.


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