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Re: save-excursion doesn't restore point

From: Richard M. Stallman
Subject: Re: save-excursion doesn't restore point
Date: Wed, 25 Jan 2006 21:47:07 -0500

    I would guess that this is because save-excursion uses markers, and
    those markers then get invalidated by shell-command-on-region.

I think so.

    it's still a little weird.  Is this a bug?
I think it is simply inevitable.  If all the text is replaced,
Emacs has no way of knowing what new position corresponds in any sense
to some old position.

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