Phil Sainty <psainty@orcon.net.nz> writes:

Hi Phil,

> In 27.1 this code is in `image-next-file'.  In master it's now
> `image-mode--directory-buffers', but the relevant code looks
> the same:
>
>       ;; Find a dired buffer.
>       (dolist (buffer (buffer-list))
> 	(with-current-buffer buffer
> 	  (when (and (derived-mode-p 'dired-mode)
> 	             (equal (file-truename dir)
> 		            (file-truename default-directory)))
>
> That call to (file-truename default-directory) for each dired
> buffer can cause tramp to spin up for closed connections for
> entirely irrelevant dired buffers.

I've reproduced the problem. As said already (?), it is similar to
bug#54542. The solution there was to wrap the code in question by
let-binding non-essential to t, and to enhance Tramp to behave
accordingly.

The Tramp change is already in the master branch, and also in the just
released Tramp 2.5.2.3 on GNU ELPA. So I've applied the following change
in master: