[bug #63046] [mdoc] handle rendering option strings and registers as man(7) does

[G. Branden Robinson]

Update of bug #63046 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #8:

I'm punting MF and U to a subsequent release since there are thorny issues
with PDF hotspots to work out for generalized hyperlink support.

Reconceptualizing this as bringing mdoc(7) into parity with man(7) as of groff
1.22.4, this is complete.


commit 78922cf9f39f6ebcd3a80aaab9c3a2931b8b0ad4
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Dec 27 02:46:19 2022 -0600

    [mdoc]: Support `HF` string.
    
    * tmac/doc.tmac (initialization): Add logic supporting `HF` string just
      as our man(7) implementation does.  If the font name ends with `B` (as
      the default does), set `doc-remap-I-style-in-headings` register and
      extract font family, which can be empty (as is the default).
    * tmac/mdoc/doc-common (Sh, Ss): If `doc-remap-I-style-in-headings`
      register set, perform (and unwind) font remapping of italic to
      bold-italic face.
    * tmac/mdoc/doc-ditroff:
    * tmac/mdoc/doc-nroff: Define `doc-Sh-font` in terms of `HF`.
    
    * tmac/tests/doc_heading-font-remapping-works.sh: Test it.
    * tmac/tmac.am (tmac_TESTS): Run test.
    
    * tmac/groff_mdoc.7.man (Options): Document it.
    * NEWS: Update item.
    
    Fixes last part of <https://savannah.gnu.org/bugs/?63046>.



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