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From: Richard Stallman <rms@gnu.org>
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Subject: Re: problem with mh-e and 2002-08-20 change to font-core.el
Date: Tue, 27 Aug 2002 13:05:51 -0600 (MDT)
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Text properties are part of the buffer contents, so it is proper that
changing them normally marks the buffer as changed.  Perhaps in this
particular case we should mark the buffer as unmodified again.

But the real issue is, why does that command cause a change in major
modes, and should it run this hook at all?