[bug #60657] [mm] refer fills undefined fields with value of previous entries

[G. Branden Robinson]

Update of bug #60657 (project groff):

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

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Follow-up Comment #5:


commit 1db6dd3435ea0306a763c39383f3b46ade51845b
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Mar 6 05:28:00 2022 +1100

    [mm]: Fix Savannah #60657.
    
    [refer,mm]: Add and use `ref*reset` macro to clean up between
    bibilography entries.
    
    * tmac/refer.tmac (]-): Move string clean up logic from here...
      (ref*reset): ...to this new macro.  Now we can also use it...
    
    * contrib/mm/refer-mm.tmac (ref*][-first-pass): ...here.
    
    Problem appears to date back to refer-mm.tmac's introduction in January
    2011.  Thanks to Bjarni Ingi Gislason for the root-cause analysis and
    proposed fix, to which I applied the DRY principle and added a reset of
    `ref*string` as well.
    
    Fixes <https://savannah.gnu.org/bugs/?60657>.


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