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desktop.el fails to restore nov.el EPUB buffers

From: artur.brzozowski
Subject: desktop.el fails to restore nov.el EPUB buffers
Date: Fri, 22 Jul 2022 13:37:17 +0000


It seems that desktop.el is unable to properly restore epub files in
nov-mode; reading an .emacs.desktop file saved with a buffer
displaying an epub file under nov does not restore the buffer.

This can be reproduced with

(require 'nov)
(require 'desktop)
(add-to-list 'auto-mode-alist '("\\.epub\\'" . nov-mode))
;; the following is required to save the nov-mode buffer state and
;; use the default `desktop-restore-file-buffer'
(add-hook 'nov-mode-hook #'(lambda () (setq-local desktop-save-buffer t)))

and then visiting an epub file and saving the desktop.  Reading the
saved desktop file with `desktop-read' fails to restore the nov/epub

I thought that since nov-mode is hooked to epub files, the basic file
handler should work, but this suggests a dedicated handler set through
the `desktop-save-buffer'/`desktop-buffer-mode-handlers' tandem may be

Is this a bug, or should I start thinking of writing a handler?
Perhaps someone has already implemented it?

With regards,

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