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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: detect narrowing?
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Kin Cho <kin@neoscale.com> writes:

> Is there a way (in elisp) to detect that a buffer is narrowed?

I think this should work:

(defun narrowing-in-effect-p ()
  (/= (buffer-size) (- (point-max) (point-min))))