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From: Glenn Morris <rgm@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: undo weirdness with insert-file-contents
Date: Thu, 28 Feb 2008 15:28:50 -0500
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Cc: Bill Wohler <wohler@newt.com>, emacs-devel@gnu.org
To: martin rudalics <rudalics@gmx.at>
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martin rudalics wrote:

> Bill, please try whether the attached patch works.

Works for me. However the behaviour differs from Emacs 22:

(progn
  (pop-to-buffer "foo")
  (insert-file-contents "/etc/issue")
  (goto-char (point-max))
  (insert-file-contents "/etc/issue"))
M-x undo

now works in both 22 and 23, but in 22 the buffer is marked as not
modified after undo. It 23 it is marked as modified.