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From: martin rudalics <rudalics@gmx.at>
Newsgroups: gmane.emacs.devel
Subject: Re: "Attempt to modify read-only object" error with
	set-frame-configuration
Date: Thu, 20 Dec 2007 17:02:44 +0100
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 > Try this:
 >
 > (let* ((cfg (current-frame-configuration))
 >        (atr (cdadr cfg)))
 >   (setcar atr (assq-delete-all 'horizontal-scroll-bars (car atr)))
 >   (setcar atr (assq-delete-all 'visibility (car atr)))
 >   (set-frame-configuration cfg))

Splendid!  Where can we fix this (at least temporarily)?  In
x_set_frame_parameters?