[bug #62901] [pic] accept `.PY` as synonym for `.PF`

[G. Branden Robinson]

Update of bug #62901 (project groff):

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

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Follow-up Comment #3:


commit 1ac8764fa7f3b91e7d2a84261edbdc84c1ae4158
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Aug 14 23:52:40 2022 -0500

    [pic]: Recognize `.PY` as synonym of `.PF`.
    
    * src/preproc/pic/main.cpp:
    * src/preproc/pic/pic.h: Add new Boolean variable,
      `want_alternate_flyback` to record `.PY` usage.
    
    * src/preproc/pic/main.cpp (top_input::get, top_input::peek): Recognize
      it.  Update diagnostic messages to mention it.
    
      (main): Define `PY` troff macro as empty if not defined.
    
    * src/preproc/pic/troff.cpp (troff_output::finish_picture): Don't
      advance the vertical position if `want_alternate_flyback`.  Write out
      the `PY` macro call if it was on the input.
    
    * src/preproc/pic/pic.1.man: Document it.
    
    * tmac/pic.tmac (PY): Define the same as `PF`.
    
    * NEWS: Add item.
    
    Fixes <https://savannah.gnu.org/bugs/?62901>.
    
    Also drop old-style Emacs file-local variable settings.



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