[bug #43532] [man] abbreviate titles when too wide, instead of overlapping them

[G. Branden Robinson]

Update of bug #43532 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 
                 Summary: [man] put titles on separate lines when parts too
wide, instead of overlapping them => [man] abbreviate titles when too wide,
instead of overlapping them

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Follow-up Comment #7:


commit b7f38e8a1d698e1078d7c215d08fde57d8e919b9
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Jun 4 00:41:20 2021 +1000

    tmac/an-old.tmac: Fix Savannah #43532.
    
    * tmac/an-old.tmac (an-abbreviate-title): Add new internal macro to
      reduce the length of a man page title (i.e., the "ls" in "ls(1)", if
      it is too wide to fit in the page header (and would overwrite the
      center header material, usually the title of the manual section).
      Since the beginning and end of the title might be important for
      disambiguation, truncation at either end would be unwise; replace the
      middle of the title with an ellipsis.  Define new an-pageref and
      an-title-abbv strings for use by other macros and user-defined PT and
      BT traps.
    
      (PT, an-footer): Use new an-pageref string for economy.
    
      (an-header): Call an-abbreviate-title after setting the title length.
    
    Fixes <https://savannah.gnu.org/bugs/index.php?43532>.


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