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(emacs-lisp-intro.info)Narrowing & Widening

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Narrowing and Widening
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   Narrowing is a feature of Emacs that makes it possible for you to
focus on a specific part of a buffer, and work without accidentally
changing other parts.  Narrowing is normally disabled since it can
confuse novices.

Narrowing advantages

The advantages of narrowing

save-restriction

The `save-restriction' special form.

what-line

The number of the line that point is on.

narrow Exercise