Re: Introduce "killed" state for xwidgets (Re: shr using `make-xwidget' incorrectly)

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Po Lu <luangruo@yahoo.com>
>> Cc: emacs-devel@gnu.org
>> Date: Thu, 11 Nov 2021 14:37:49 +0800
>> 
>> +DEFUN ("xwidget-live-p", Fxwidget_live_p, Sxwidget_live_p,
>> +       1, 1, 0, doc: /* Return t if OBJECT is an xwidget that has not been 
>> killed.
>> +Value is nil if OBJECT is not an xwidget or if it has been killed.  */)
>> +  (Lisp_Object object)
>> +{
>> +  return ((XWIDGETP (object)
>> +       && !NILP (XXWIDGET (object)->buffer))
>> +      ? Qt : Qnil);
>> +}
>
> What if the xwidget's buffer was itself killed? should this also test
> that situation?

When the buffer is killed, all of its xwidgets are killed first, which
means XXWIDGET (object)->buffer will always be nil in that case.

Thanks.