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

[Lars Ingebrigtsen]

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.

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