bug#66117: 30.0.50; `find-buffer-visiting' is slow when opening large number of buffers

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

>> I must say I don't understand the reasoning behind this.
>> What would it do different from `case-fold-search`?
>
> It won't be buffer-local-if-changed, so binding it will not be costly.
> It also won't be a defcustom, so let-binding it will not step on the
> user's preferences.

In my mind, another benefit is that the new variable will not be
affected by buffer-local values - (let (case-fold-search-override value) ...)
will be guaranteed to use VALUE everywhere, even if current buffer is
changed. This will make the case I described in
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66117#208 more predictable
(and, since it is a new variable, will not break any existing code).

-- 
Ihor Radchenko // yantar92,
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