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From: Teemu Likonen <tlikonen@iki.fi>
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Subject: Re: how to set case-fold-search (back to) NON-nil, EVERYWHERE?
Date: Mon, 29 Jun 2009 23:36:04 +0300
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On 2009-06-29 16:15 (-0400), David Combs wrote:

> (No, (setq case-fold-search 1) doesn't seem to do it GLOBALLY.)

Try:

    (setq-default case-fold-search t)

It sets the global value but it won't have effect on buffer's which
already have buffer-local binding for the variable. You can execute

    (kill-local-variable 'case-fold-search)

in such buffers and then they start using the global value again.