Re: search-default-mode char-fold-to-regexp and Greek Extended block characters

[Eli Zaretskii]

> From: Juri Linkov <address@hidden>
> Date: Thu, 25 Jul 2019 21:46:20 +0300
> 
> > But this one I donʼt understand. Searching for iota (capital or small)
> > in a buffer containing ΐ ΐ or Ϊ́ already works with
> > char-fold-to-regexp, so why is this needed?
> 
> Searching for ι finds ΐ only when searching for a single letter ι
> because the search matches the first part of ΐ that contains the base
> character ι and ignores the remaining combining accents like ̈́
> 
> So for testing you need to search for longer strings, e.g.
> in a buffer with this text "ΐΐΪ́." try to search for "ιιι."
> 
> It fails to find this text without adding (?ι "ΐ")
> to char-fold-include.

Maybe we should decide that this is a limitation of the current
implementation, and instead work on a more correct implementation,
which actually "folds" characters to their base variants as the search
proceed.

Let's not forget that the current implementation was known to be
limited from the get-go, and we only accepted it because the "full"
one was too complex and required non-trivial changes on the C level.
So we shouldn't go too far into making the current implementation
support everything that the full one will inherently support.