bug#63563: 29.0.91; package.el should not install unselected packages

[Jimmy Wong <wyuenho@gmail.com>]

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Thank you so much!
On 29 May 2023 at 2:47 PM +0100, Eli Zaretskii <eliz@gnu.org>, wrote:
> > From: Jimmy Yuen Ho Wong <wyuenho@gmail.com>
> > Date: Mon, 29 May 2023 01:51:11 +0100
> > Cc: Eli Zaretskii <eliz@gnu.org>, 63563@debbugs.gnu.org
> >
> > Is this new behavior no one asked for configurable? Over the many years I've been using package.el,
> > I've built in muscle memory. After M-x list-packages, when the packages buffer is done refreshing, I
> > immediately press U and x without looking. With the new behavior, when there's no upgrades, I'd be
> > installing the first package at point. Doing that a couple of times will mean I'll have a couple of extra
> > packages I don't want installed.
>
> It turns out this behavior is new in Emacs 29, see bug#40457 and NEWS.
> Since the new behavior is incompatible with the old one, I have now
> added a new user option, package-menu-use-current-if-no-marks, to get
> back the old behavior, and mentioned it in NEWS. You can now
> customize that option to a nil value to get what you want.

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