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From: Richard Stallman <rms@gnu.org>
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Subject: Re: spaces in isearch
Date: Mon, 22 Nov 2004 09:07:01 -0500
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    Since C-q in isearch mode is processed by isearch-quote-char,
    it could intercept SPC and insert [ ] into the search string.

I thought about that, but it would not work right in all contexts.
For instance, suppose you're inside a [...] grouping already.

It's true that you don't *need* to use C-q if you're inside a [...]
grouping already.  But using it there shouldn't cause wrong results.