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From: daniel@bigwalter.net (Daniel Jensen)
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Subject: Re: Highlight new lines
Date: Wed, 06 Jun 2007 14:12:07 +0200
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weber <hugows@gmail.com> writes:

> "I saw this feature on emacs a while back and it was pretty useful.
> Recently modified lines were colored red since they were 'hot' and as
> lines got older the colors would move towards blue since they were
> 'colder'."

It is called Highlight Changes mode. See the documentation for
highlight-changes-mode and highlight-changes-rotate-faces for
instructions on how to use it.