bug#30786: Save text properties in desktop

[Juri Linkov]

>>>>>> +     ;; 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))))
>
>> If we can afford continuing incrementing the desktop file version in
>> ‘desktop-file-version’ doing this every time when support for reading more
>> syntaxes is added, thus preventing incompatibilities, then the patch above
>> would be the most reliable solution.
>
> You would also have to strip text properties according to the value of
> desktop-file-version, right?

This won't help for the counterexample that you demonstrated earlier with
(put-text-property 1 2 'foo (point-marker)).  Whereas this patch does.