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: luangruo@yahoo.com,  ignaciocasso@hotmail.com,  53894@debbugs.gnu.org
> Date: Thu, 10 Feb 2022 09:43:58 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > 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.
> 
> But it's surprising (and frustrating) to click on "Copy text" in a
> different application and then (sometimes) not being able to yank it
> with `C-y'.  So if we can fix that (and it sounds like we can (on most
> platforms) now, since Po Lu introduced the
> `gui-backend-selection-owner-p' function), we should.

Using paste from the clipboard mixed with C-y/M-y will always be
tricky, no matter what we do.  That's why we have
save-interprogram-paste-before-kill.

But if this can be made less tricky, I don't mind doing that, of
course.