bug#64185: proposal for new function: copy-line

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Fri, 23 Jun 2023 11:07:58 +0200
> Cc: Eli Zaretskii <eliz@gnu.org>,
>  64185@debbugs.gnu.org,
>  me@eshelyaron.com,
>  zkanfer@gmail.com
> 
> Finally, it's a bit surprising that this is even discussed for inclusion in 
> Emacs 29 at this stage, given the raw state of the design. What about we do a 
> proper job on master instead, instead of rushing a half-baked new feature 
> into a branch that is already deep into pre-release?

This is a new feature in Emacs 29, so adding customization
opportunities to it that allow fine control of its behavior is fine at
this stage.  Of course, if the proposal is controversial, we shouldn't
rush.  My impression till now was that it wasn't controversial.  If
the only issue is better documentation and/or whether the value should
be a number or a symbol, then I see no problem with installing this on
the release branch.