bug#21278: char-fold isearch: space and newline still broken

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

>>> Building such mode-independent features on syntax properties
>>> is IME asking for trouble.
>>> Stefan, WDYT?
>>
>> Agreed.  I'd use something like [ \t] or [ \t\n] or even [\0-\s].
>
> Seconded.  Everyone who wants to match a newline,
> still needs to customize search-whitespace-regexp
> to include \n, e.g. "\\(?:\\s-\\|\n\\)+", so an explicit
> list of characters would be more deterministic.

It seems like everybody agrees that the old value was confusing, so I've
now changed it to [ \t] in Emacs 28.

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