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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: search-default-mode char-fold-to-regexp and Greek Extended
 block characters
Date: Tue, 23 Jul 2019 17:57:38 +0300
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To: Robert Pluim <rpluim@gmail.com>
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In-reply-to: <m2muh5oqw5.fsf@gmail.com> (message from Robert Pluim on Mon, 22
 Jul 2019 20:39:22 +0200)
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> From: Robert Pluim <rpluim@gmail.com>
> Date: Mon, 22 Jul 2019 20:39:22 +0200
> 
> The answer to that, empirically, is 'yes', since with the following
> patch the number of characters equivalent to ι increases, ie:
> 
> Standard =>
> (aref char-fold-table ?ι)"\\(?:ι[̀́̄̆̈̓̔͂]\\|[ίιϊἰἱὶιῐῑῖ𝛊𝜄𝜾𝝸𝞲]\\)"
> 
> 2 level decomposition =>
> (aref char-fold-table ?ι)"\\(?:ι[̀́̄̆̈̓̔͂]\\|[ΐίιϊἰ-ἷὶίιῐῑῒῖῗ𝛊𝜄𝜾𝝸𝞲]\\)"
> 
> n level decomposition =>
> (aref char-fold-table ?ι)"\\(?:ι[̀́̄̆̈̓̔͂]\\|[ΐίιϊἰ-ἷὶίιῐ-ΐῖῗ𝛊𝜄𝜾𝝸𝞲]\\)"

Thanks, I think you should install your patch.