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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Changing of line format and undo
Date: Wed, 21 Jun 2006 06:23:23 +0300
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> Date: Wed, 21 Jun 2006 00:15:17 +0200
> From: Lennart Borgman <lennart.borgman.073@student.lu.se>
> 
> If you change line endings this change is not saved to undo. Is this the 
> expected behaviour?

If you mean "C-x RET f", then it doesn't really change anything.  It
just sets a buffer-local variable to some value.  So there's nothing
to undo.