bug#46621: Copy line

[Mattias Engdegård]

18 juni 2022 kl. 20.09 skrev Eli Zaretskii <eliz@gnu.org>:

> There's no need to include "or region" in the command's name and doc
> string's first line.

Changed.

> Passive tense alert!
> Another one!

Both changed.
Thanks for the comments!

The attached patch now handles rectangle duplication better. (Rectangular 
regions are nice to use but can be surprisingly unpleasant to program with.)
That code was moved to rect.el where it probably belongs.

There will be tests as well.

duplicate-line.diff
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