[bug #60803] tr request does not warn when it can't translate an input space

[G. Branden Robinson]

Update of bug #60803 (project groff):

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

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Follow-up Comment #4:


commit ab5d7f57b19db156f442a6855bd8bcf37662c560
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Jul 6 00:57:08 2022 -0500

    [troff]: Throw error when `tr`ing from a space.
    
    * src/roff/troff/input.cpp (do_translate): Throw an error diagnostic
      when the user attempts to translate space characters.  (By contrast,
      translating _to_ [unbreakable, unadjustable] spaces is an old troff
      hack often seen as ".tr ~ ", and largely superseded by groff's "\~"
      escape sequence, now widely supported by troffs.)
    
    Fixes <https://savannah.gnu.org/bugs/?60803>.  Thanks to T. Kurt Bond
    and Oliver Corff for the report.



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