[bug #50917] make \- consistently render as U+002D "hyphen-minus" across all macro sets and devices

[G. Branden Robinson]

Update of bug #50917 (project groff):

                Category:                    None => Device - others/general
             Assigned to:                    None => schwarze               
                 Summary: Make \- consistently render as U+002D across all
macro sets and devices => make \- consistently render as U+002D "hyphen-minus"
across all macro sets and devices

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Follow-up Comment #7:

Ingo's comment #1 is worth reviewing for anyone who happens across this
ticket, perhaps consequent to a web search.

I will add that on top of pretty much rewriting groff_char(7) since groff
1.22.4, I have over the past week or two added a lot of material that
amplifies the points made by Doug McIlroy, referenced in comment #1, and
others.

These include groff's de-unification of the vertical bar and bitwise or
operator, of the overline and radical extension, of the underscore and
underrule, and the "text" versus "special" "variants" of seven glyphs: plus,
minus, equals, logical not, plus-minus, multiplication sign, and division
sign.

I also discuss "font-invariant" glyphs in more depth than we found in the
1.22.4 version of the man page.

I further attempt to explain what all these quoted terms _mean_.

https://git.savannah.gnu.org/cgit/groff.git/tree/man/groff_char.7.man

Okay, I'll put down my horn now.

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