bug#37036: [PATCH] Inconsistent ASCII and Latin char categories

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Thu, 15 Aug 2019 14:17:15 +0200
> 
> The ASCII (a) and Latin (l) character categories are inconsistent in what 
> characters they contain.
> 
> It should be clear what the ASCII category means, but it omits 00-1f 
> (contrary to a comment in the code).
> 
> The Latin category isn't exactly defined anywhere but should reasonably 
> comprise letters from Latin-based scripts. Currently, it also includes many 
> control characters and symbols from the ASCII and Latin-1 Supplement blocks, 
> which seems hard to justify.
> 
> Other changes to Latin could be argued: what modifiers/combining chars should 
> be included? What about IPA and non-IPA phonetics? Ligatures? What about 
> Latin-derived forms such as circled letters? &c. The attached patch does not 
> go there but only fixes the glaring errors in the 00-ff range.

Did you try moving by words after these changes?  What happens in
words that consist of ASCII and non-ASCII Latin characters, for
example?