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bug#30786: Save text properties in desktop

From: Noam Postavsky
Subject: bug#30786: Save text properties in desktop
Date: Mon, 02 Apr 2018 17:48:09 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux)

Juri Linkov <address@hidden> writes:

> Even when the print syntax becomes readable in later versions, we still
> can't write such syntax because earlier Emacs versions should be able
> to read the same desktop file.

> Do you think this patch covers all possible unreadable cases on writing?

> +     ;; Get rid of unreadable text properties.
> +     (if (ignore-errors (read (format "%S" value)))
> +         (cons 'may value)
> +       (let ((copy (copy-sequence value)))
> +         (set-text-properties 0 (length copy) nil copy)
> +         (cons 'may copy))))

I think it won't cover the case where an object's print syntax is only
readable by the current Emacs version, and not an earlier one.  To
handle that you'll need to call desktop--v2s recursively, like in the
vectorp and consp branches.

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