bug#46621: Copy line

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

>> I've now added this command to Emacs 29 as `duplicate-line'. 
>
> Thank you! There was quite some discussion about generalising the
> concept last time it came up for discussion, and making it work on the
> region when active was found to be very useful. It comes quite
> naturally in use, much like upcase-dwim etc.
>
> The attached patch does that. For extra convenience, when the active
> region is rectangular it is duplicated to the right, since that is
> what is usually most convenient.

Simen proposed something quite similar (added to the CCs), and my only
objection was that the semantics of the simpler command is quite
clear -- it always creates a new line, even if we're at a final line in
a buffer without a newline.  When dealing with regions, it's not quite
clear what the semantics should be in those corner cases (i.e., regions
that doesn't end with a newline)...

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