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

[Po Lu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> No, the problem is still present on the trunk.  But I suspect that after
> you introduced the `gui-backend-selection-owner-p' test in
> gui--selection-value-internal, the logic surrounding
> gui--last-selected-text-clipboard in gui-selection-value is no longer
> necessary, and should just be removed now.

Indeed, it should be removed for the platforms where
`gui-backend-selection-owner-p' does work.

> But I haven't analysed the problem in depth, and I don't know how this
> works on non-X systems -- perhaps that DWIM logic in gui-selection-value
> is still necessary on some systems.

It is, `gui-backend-selection-owner-p' does not work reliably on some
other platforms such as PGTK and NS.