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Daniel Jensen wrote:

>> "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.

Is nice. Is there a method to activate this option automatically?