[bug #62339] [doc] add guidance about single-level caching of formatting parameters

[G. Branden Robinson]

Update of bug #62339 (project groff):

                Severity:              3 - Normal => 1 - Wish               
                  Status:               Need Info => None                   
                 Summary: [doc]: Add a remark about a pitfall using \s0 =>
[doc] add guidance about single-level caching of formatting parameters

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Follow-up Comment #5:

I had intended to solicit more general wording, not this highly particularized
discussion of the `\s` escape sequence.

I would like to see language suitable for a node in our Texinfo manual that
discusses the general (but sadly not perfectly consistent) practice of *roff
programs maintaining a 1-level cache of formatting parameters.

* Requests and escape sequences that behave this way can be listed.
* \s0 and \fP should be called out explicitly because of their unusual
semantics.
* .hy without arguments should be called out for its deviation from the
general behavior.


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  <https://savannah.gnu.org/bugs/?62339>

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