[bug #65983] [troff] starts document preumaturely upon `lf` request

[G. Branden Robinson]

Update of bug #65983 (group groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #1:


commit f1e603870c1352995bb109321051713bcb283343
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Jul 13 04:07:55 2024 -0500

    [troff]: Fix Savannah #65983.
    
    * src/roff/troff/input.cpp (file_iterator::set_location): Stop
      initializing the output.  Preprocessing empty documents could lead to
      baffling results.  In groff 1.22.4 and before, you'd get a blank
      document from some output drivers despite no evident reason from the
      preprocessed input that this should be the case.  In groff 1.23.0,
      this happened for fewer output drivers but still generated a
      mysterious diagnostic.
    
        fatal error: 'V' command invalid before first 'p' command
    
      It turns out to be unnecessary to initialize `the_output` upon
      encountering an `lf` request.  The spurious output aspect of the
      problem dates back to commit e092fba4517, 6 February 2000
      {"groff pre-1.16"}.
    
      Fixes <https://savannah.gnu.org/bugs/?65983>.




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