[bug #62257] [man] don't slice the center footer in the middle of an escape sequence

[G. Branden Robinson]

Update of bug #62257 (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 223814d9c217a8ac137e9e521297377572e31526
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Apr 8 07:48:45 2022 +1000

    [man]: Abbreviate TH arguments more carefully.
    
    * tmac/an.tmac: Do it.
    
      (an*scan-string-for-backslash): Add new helper macro.
    
      (an*abbreviate-inner-footer): Rewrite.  Use the foregoing and a
      different technique to compute available space and shorten the string.
      So that we don't break the inner footer in the middle of an escape
      sequence, just trim characters from the end.
    
    Fixes <https://savannah.gnu.org/bugs/?62257>.



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