How to mark new text in a buffer ?

[Xavier Maillard]

Hi,

I am looking for the best way to identify new entered text into a
buffer and show that information.

For example, I am visiting a file-based buffer -i.e. a buffer
visiting a file. It has already content and I am typing something
like "foo bar". I want to display "foo bar" in such a way that we
get direct information on what is new and what is old.

Any idea ?

        Xavier
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