bug#48478: 28.0.50; yank-from-kill-ring and kill-ring-yank-pointer

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: 48478@debbugs.gnu.org
> Date: Thu, 03 Jun 2021 23:55:01 +0300
> 
> > (and the setting of the kill-ring pointer) soon, because
> > currently the documentation of the new behavior of M-y in the manual
> > is incomplete, and I'd like to complete it before I forget.
> 
> Sorry, I forgot what is the setting of the kill-ring pointer?
> That needs to be fixed as well?

In the following use case:

  M-y
  <type something>
  TAB                     (1)
  <edit the completion>   (2)
  RET
  C-y

the last C-y inserts neither the unedited completion in (1) nor the
edited one in (2).  It inserts something else.  It should insert one
of these two, IMO, otherwise this behaves very different from

  C-y
  M-y
  M-y
  ...
  C-y