bug#27442: Un-obsolete x-clipboard-yank, or provide analogous functional

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: monnier@iro.umontreal.ca,  Hi-Angel@yandex.ru,  27442@debbugs.gnu.org
> Date: Tue, 06 Jul 2021 16:18:18 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Hm...  I don't really see any with our current low-level
> >> functions.  I think x-get-selection-internal could have returned more
> >> metadata -- the timestamp, for instance, which would have allowed us to
> >> see whether we ourselves really pushed the data to the clipboard.
> >
> > Where would that time stamp come from?
> 
> Selections have time stamps

In the clipboard? supported by all the systems and all the clipboard
varieties out there?

> so we could compare the time stamp from
> when we pushed the data onto the clipboard with what we have.  I think?

Is it reasonable to assume that close enough time stamps necessarily
mean we are the owner?

> > I admit I don't really understand what the patch does and how.  can
> > you elaborate on that?
> 
> It just makes `M-x clipboard-yank' defeat the "check for duplicates"
> logic and always return the contents of the clipboard.

But that would mean we throw away the baby together with the
bathwater, no?  Why would we want to do that?