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

From: Constantine Kharlamov
Subject: bug#27442: Un-obsolete x-clipboard-yank, or provide analogous functional
Date: Wed, 21 Jun 2017 22:55:58 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0

On 21.06.2017 22:10, Eli Zaretskii wrote:
>> From: Constantine Kharlamov <address@hidden>
>> Date: Wed, 21 Jun 2017 17:29:40 +0300
>> x-clipboard-yank always uses clipboard content, which is exactly what I 
>> need. I.e. if I set (setq select-enable-clipboard nil) to not clutter my 
>> clipboard with kills, I only get content from the clipboard. (don't get me 
>> wrong, kill-ring is very cool, and I extensively use it in evil-mode. But I 
>> prefer to explicitly point when I want a content in the clipboard, which 
>> happens an order of magnitude rarer than usage of kill-ring).
>> clipboard-yank uses a kill-ring instead.
> I see the same call to 'yank' in both clipboard-yank and
> x-clipboard-yank, so I'm not sure I understand what difference in
> behavior you see (you also didn't say which version of Emacs did you
> use).

Sorry. It's 26.0.50, Archlinux, emacs-gitᴬᵁᴿ. However the first time I saw the 
problem at least 1.5 year ago on Ubuntu. It's just that I never reported, but 
today I started worrying.

> Can you show a reproducible recipe starting from "emacs -Q"
> which could be used to see the problem?
> Thanks.

Well, for collecting the steps turned out `(clipboard-yank)` might have another 
subtle bug. But what I said still holds. Steps:

1. start `emacs -Q`
2. Press M-: to execute `(setq select-enable-clipboard nil)`
3. Copy a text in the system, i.e. outside of Emacs.
4. Press M-: to execute `(clipboard-yank)` (you'll get at the point a content 
from system clipboard)
5. Press M-< M-d (so now you have the word ";; This" in kill-ring)
6. Press M-: to execute `(clipboard-yank)`

        You will see ";; This" got pasted at point, not the value in the system 

7. Press M-: to execute `(x-clipboard-yank)`

        You will see content from the system clipboard got pasted at point.

The subtle bug I just found is an inconsistent behavior: if you skip the 4-th 
step, then at 6-th step you'll see the content from system clipboard. Which is 
actually what I'd want (i.e. the system clipboard content, not the inconsistent 
behavior, of course), but in long-term usage it pastes from kill-ring.

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