On 14/10/2021 22:44, Max Nikulin wrote:
> 
> I think, something should be done with `org-no-popups'. Assume a user 
> who has (I have no idea concerning the goal though)
> 
>    (setq pop-up-frames t)
>    (setq display-buffer-base-action
>          '((display-buffer-reuse-window display-buffer-pop-up-frame)
>            (reusable-frames . 0)))
> 
> With "emacs -Q" and above settings completion e.g. for "C-h f" does not 
> cause creation of a new frame. Org help windows appear in new frames 
> though. That is why `org-no-popups' should have more code.

I was wrong, (setq pop-up-frames t) leads to creation of new frame for 
*Completion* buffer at least in Emacs-26.3.

It seems, each case of `org-no-popups' may require specific code. I have 
tried to take some code related to completion. It overrides 
display-buffer-base-action, but something more is required for 
pop-up-frames.
That code uses `with-current-buffer-window' while org-goto uses 
`with-output-to-temp-buffer'. I am unsure what variant is more suitable 
for org-goto.

I am attaching my draft with minimal changes. I do not like to rely on 
internal functions but I have not found high level replacement to 
achieve the same result. Maybe emacs code has a better variant somewhere.