bug#23097: 24.5; ispell.el: lines with both CASECHARS and NOT-CASECHARS get sent to the spell checker

[Eli Zaretskii]

> From: Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>
> Date: Wed, 23 Mar 2016 21:11:19 +0300
> 
> Each entry ispell-dictionary-alist has elements called CASECHARS and 
> NOT-CASECHARS. They are used for defining what gets sent to the spell 
> checker and what does not.
> 
> One use case for them is that, if you have two dictionaries for 
> languages with totally different alphabets, you can spellcheck a file 
> where both languages are mixed together. In theory.

Don't you need to restart the spell-checker each time you switch the
dictionaries?  AFAIK, only Hunspell supports such mixed
spell-checking, and with Hunspell you don't need to break the line
into separate words in that case.  With any other spell-checker, you
need to restart it whenever you switch languages.