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bug#38647: 26.3; image-next-file does not consider archived images

From: Juri Linkov
Subject: bug#38647: 26.3; image-next-file does not consider archived images
Date: Wed, 05 Aug 2020 02:47:44 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (x86_64-pc-linux-gnu)

>> All this indicates that instead of using 'directory-files',
>> 'image-next-file' should rely on 'archive-next-line' if the file
>> is opened from an archive, and on 'dired-next-line' otherwise.
> `archive-next-line' isn't used in tar mode buffers -- that's the
> problem: There's no unified interface across the different archive
> modes.  (Although perhaps there's just two?  arc-mode and tar-mode?

Yep, there's just two - these twins are going hand in hand,
for example, in image-mode.el in image-toggle-display-image:

                           (not (and (boundp 'archive-superior-buffer)
                           (not (and (boundp 'tar-superior-buffer)

>> Also this means that if there is no corresponding dired buffer
>> already visited, then 'image-next-file' should create an internal
>> dired buffer just for the sake of file image navigation.
> Hm.  I think that makes sense...  but it would perhaps be a bit
> surprising?

Maybe when not requested, such Dired buffer should be killed afterwards,
or its name should start with a space.

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