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From: Richard Stallman <rms@gnu.org>
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Subject: Re: text properties
Date: Wed, 28 Jul 2004 18:09:42 -0400
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    Is it expected that evaluating this form sets `modified' flag
    of the current buffer even though fontifying by adding a hook
    by `jit-lock-register' does not?

	    (add-text-properties 1 (1+ (buffer-size))
				 '(face nil invisible nil))

Calling add-text-properties counts as modifying the buffer.