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From: Eli Zaretskii <eliz@gnu.org>
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Subject: buffer-swap-text
Date: Tue, 21 Oct 2008 12:42:10 +0200
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Should this function swap the value of buffer-file-coding-system as
well?  Otherwise, we could confuse the user if the swapped text cannot
be saved with the current buffer's encoding, and we will then pop up
questions when the user tries to save.