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

[Ihor Radchenko]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> It won't be buffer-local-if-changed, so binding it will not be costly.
>
> As mentioned elsewhere in this bug-report we can make `case-fold-search`
> into a `DEFVAR_LISP`: it would have no visible impact to ELisp and would
> avoid the costly let-bindings.

Wouldn't DEFVAR_LISP break major modes that do (setq case-fold-search ...)?

-- 
Ihor Radchenko // yantar92,
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