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From: Teemu Likonen <tlikonen@iki.fi>
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Subject: Re: see quickly last changes
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On 2010-01-20 13:05 (+0100), andrea wrote:

> Sometimes it would be nice to see visually what's the difference
> between the buffer and the file, visually.

> Is there something like that already maybe?

There is:

    M-x highlight-compare-with-file

and some options:

    M-x highlight-changes-mode
    M-x highlight-compare-buffers
    M-x diff-buffer-with-file