bug#20871: 25.0.50; fill-single-char-nobreak-p does not recognize a single-letter word when it is preceded by an open paren

[Eli Zaretskii]

> From: Marcin Borkowski <mbork@mbork.pl>
> Cc: 20871@debbugs.gnu.org
> Date: Sat, 30 Apr 2016 18:41:32 +0200
> 
> >> (define-category ?l "Latin
> >> Latin letters (including those with diacritics)")
> >
> > That doesn't sound right: why single out diacritics?  And why only for
> > Latin?
> 
> Because I don't really know what this category is about?
> 
> I think that my confusion is a sufficient proof that more precise
> documentation is needed.

I didn't object to expanding the doc string, I only suggested that we
do it right.

> > If we want to enhance those doc strings, each one of them should state
> > what Unicode blocks are covered.  (It would be okay to say something
> > like "all Latin blocks", instead of enumerating them all, and
> > similarly for the other categories.)
> 
> A user might not know what exactly a "Unicode block" is.  (I don't.)
> I think a pointer to some sources or a few words of explanation are
> really needed.

A reference to the ELisp manual should do (the explanation should be
added to the manual first, of course).

> (I won't make a patch, though, since I clearly know too little about
> it to do it correctly.)

An opportunity to learn, I'd say.  You could start with
admin/unidata/Blocks.txt, for example.  We use it to generate
charscript.el (and categories are a semi-obsolete facility that
predates char-script-table).