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bug#40216: 28.0.50; Misinformation in isearch char-fold

From: Juri Linkov
Subject: bug#40216: 28.0.50; Misinformation in isearch char-fold
Date: Fri, 27 Mar 2020 01:04:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (x86_64-pc-linux-gnu)

>     >> Do we need an option to char-fold-regexp that says 'only apply
>     >> char-folding to non-ascii characters'?
>     Eli> But this feature is not intended only to find variants of non-ASCII
>     Eli> characters when one searches for a non-ASCII, it is also intended to
>     Eli> find variants when searching for ASCII characters.  For example,
>     Eli> searching for a is supposed to find ä and à and á.  Or am I missing
>     Eli> something?
> Yes, thatʼs exactly right. But in the case where you have mainly
> characters where you donʼt want case-folding, it might make sense to
> restrict the folding to non-ascii as an optimisation. eg. Suppose my
> name were Røbert, with people frequently misspelling it as Robert, I
> might want isearch to just search for "R\\(?:ǿ\\|[øǿo]\\)bert"

I tried to find Røbert by typing Robert, but char-fold fails to find it.
A bug in char-fold?

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