[bug #64013] [ms] EQ macro ignores second argument if first empty

[G. Branden Robinson]

Update of bug #64013 (project groff):

                  Status:         Ready for Merge => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #3:


commit 380386369405245707207dc467dd99d9f9a6d45f
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Apr 7 20:22:46 2023 -0500

    [ms]: Fix Savannah #64013.
    
    * tmac/s.tmac (@EQ): Revise argument handling.  If there is only one
      argument and it is not a recognized alignment, warn and treat it as an
      equation label.  If there are two arguments but the first is not a
      recognized alignment, throw a warning diagnostic (but still use
      default alignment with the second argument as label).  An explicitly
      empty first argument is synonymous with "C".
    
    Fixes <https://savannah.gnu.org/bugs/?64013>.
    
    Also tested with:
    
    .LP
    .EQ "" (1)
    x + y = z
    .EN
    .EQ (2) \" expect warning
    pq = 0
    .EN
    .EQ R (3) \" expect warning
    ab = 1
    .EN
    .EQ
    E = mc sup 2
    .EN




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