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

[Juri Linkov]

>> 1. select the word "This" and type M-w
>> 2. select the word "buffer" and type M-w
>> 3. type M-y M-p
>>
>> The minibuffer looks like:
>>
>>   Yank from kill-ring: This
>>
>> but should be
>>
>>   Yank from kill-ring: buffer
>
> So you don't like that M-p yields "This" and M-n yield "buffer" in
> this case?  Why not?  IOW, why did you expect M-p to yield "buffer"?
> This is M-y, not C-y.

But this is not 'M-y C-y'.  The logic is the following:
one key (either non-minibuffer 'C-y' or minibuffer 'M-y') should yank the last 
item,
two keys (non-minibuffer 'C-y M-y') should yank the second last item.

Another reason is that 'M-y M-p' can omit the last item only
after a previous invocation of 'M-y' that rotated the pointer.