[bug #58337] negative arguments to .ss request cause assertion failure

[G. Branden Robinson]

Follow-up Comment #2, bug #58337 (project groff):


commit c3047d8f5881e21cf4f09c13d88106c71aa25004
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat May 9 10:55:06 2020 +1000

    Fix assertion failure on negative space size.
    
    * src/roff/troff/env.cpp (space_size): If an argument to the .ss request
      is negative, throw a range warning and ignore it.
    
    * src/roff/groff/tests/regression_savannah_58337.sh: Add test.
    
    * src/roff/groff/groff.am: Run test.
    
    Fixes https://savannah.gnu.org/bugs/index.php?58337.


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