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bug#56773: 29.0.50; (readablep UNREADABLE) causes strange things

From: Po Lu
Subject: bug#56773: 29.0.50; (readablep UNREADABLE) causes strange things
Date: Wed, 27 Jul 2022 17:41:30 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux) 
Michael Heerdegen <michael_heerdegen@web.de> writes:

> Hello,
>
> emacs -Q:
>
> (progn (readablep (current-window-configuration))
>        (current-buffer))
> ==> #<buffer  prin1>
>
> After evaluating such a `readablep' call, weird things can happen
> because of this buffer being current.  I tried to actually display that
> buffer and the window I got looked quite funny, one second later Emacs
> had crashed.

Thanks, should be fixed now.
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