bug#46621: Copy line

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> They asked about making a dozen copies of a line?

I don't think anybody asked for a dozen copies in particular.

I think we should add the command, but I'm not convinced it deserves a
default key binding -- we can add that later if it turns out that this
is the break-out most-popular new command in Emacs 28.

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