bug#7252: hexl-revert-buffer

[Stefan Monnier]

> If I open a ZIP file with M-x hexl-find-file and then M-x revert-buffer,
> I see hexified file list generated by arc-mode, instead of raw ZIP data.

> This behavior is surprising for me and it is cumbersome to do M-x
> kill-buffer and M-x hexl-find-file each time.

> How about adding M-x hexl-revert-buffer?

No, we should tweak revert-buffer-function instead.

> +  (if (eq major-mode 'hexl-mode)

Use derived-mode-p rather than looking at major-mode.

> +      (let ((coding-system-for-read 'no-conversion))
> +     (revert-buffer nil nil t)
> +     (setq major-mode 'fundamental-mode)

Why is this setq needed (IOW please add a comment explaining why it's
needed).


        Stefan