bug#53894: 27.2; Clipboard copy -> C-y -> M-y -> Same clipboard copy does not push to kill ring

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Po Lu <luangruo@yahoo.com>,  ignaciocasso@hotmail.com,
>   53894@debbugs.gnu.org
> Date: Thu, 10 Feb 2022 07:39:51 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > In addition, I believe the OP claims that the algorithm we use to
> > decide (on X) when to return nil is flawed, or at least ruins his use
> > case.  I don't think I succeed to understand the rationale for that
> > claim, FWIW.
> 
> Here's the case to reproduce:
> 
> In external program, "copy" a text
> In Emacs: C-y M-y
> In external program, "copy" the same text
> In Emacs: C-y
> 
> This C-y will not yank the text.

If by "the text" you mean the text copied the second time from another
application, then Emacs on MS-Windows behaves the same as on X in this
scenario.

So now the only issue left (for me) is that I don't think I understand
why the OP doesn't like this: after all, the original text from the
clipboard is still available in the kill ring, and can be pasted given
enough M-y, or using the Edit menu-bar menu, or using the new feature
of M-y when it is invoked not after C-y or another M-y.