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Re: setnu-mode and Emacs 21.

From: Richard Stallman
Subject: Re: setnu-mode and Emacs 21.
Date: Tue, 13 Nov 2001 21:51:03 -0700 (MST)

    I thought the cleanest way would be assigning an overlay to each line
    (to just one character in each line, to be precise),

A feature like this should not work by creating hundreds or thousands
of overlays.  It should work through low-level display changes.
If we can display the line number in the mode line, we can put it in
the margin.

That requires C level changes, though.

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