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 14:26:28 +0200
> 
> (define-category ?l "Latin")
> 
> in characters.el
> 
> could be replaced by
> 
> (define-category ?l "Latin
> Latin letters (including those with diacritics)")

That doesn't sound right: why single out diacritics?  And why only for
Latin?

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.)

Thanks.