bug#16800: 24.3; flyspell works slow on very short words at the end of big file

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 22 Feb 2014 22:55:11 +0400
> From: Aleksey Cherepanov <aleksey.4erepanov@gmail.com>
> Cc: agustin.martin@hispalinux.es, 16800@debbugs.gnu.org
> 
> > > BTW solution around reduction of jump points does not not affect
> > > faces: "nd" or "badnd" at the end of "good badnd good " does not call
> > > spell check on the first "badnd".
> > 
> > Not sure I understand what you are saying here.  What "first badnd"?
> > you have only one in this example.
> 
> "nd" does not cause spell check of "badnd". Another "badnd" at the end
> does not cause spell check of the first "badnd".

Of course, it isn't; why should it?

> > > Emacs words are language sensitive too.
> > 
> > But not in the same way as ispell/flyspell is.  The CASECHARS,
> > NON-CASECHARS, and OTHERCHARS parameters of the dictionary are only
> > taken into account by ispell/flyspell.
> 
> I think one could define a dictionary like: ("my" "[a]" "[^a]" "" ...)
> So the only letter for flyspell words is "a". That way "qqaaqqaaqq" is
> one word for emacs and two words with garbage around for flyspell. I
> think my solution fails in such case.

It's more complex than that: with some languages, and at least with
aspell, we take these parameters from the dictionary.  So they cannot
be known in advance in some cases.