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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: auto-insert help-buffer
Date: Fri, 09 Mar 2007 16:27:10 -0500
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References: <45D967C4.5060104@easy-emacs.de> <87fy8fu2kv.fsf@stupidchicken.com>
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Cc: andreas.roehler@easy-emacs.de, emacs-devel@gnu.org
To: Chong Yidong <cyd@stupidchicken.com>
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In-reply-to: <874povnpa8.fsf@stupidchicken.com> (message from Chong Yidong on
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Xref: news.gmane.org gmane.emacs.devel:67658
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    !       record_unwind_protect (read_char_help_form_unwind, Qnil);
    !       help_form_saved_window_configs
    ! 	= Fcons (Fcurrent_window_configuration (Qnil),
    ! 		 help_form_saved_window_configs);

I would call record_unwind_protect after pushing the new element.

    I cancel the window config unwinding as long as the user clicks
    anywhere using the mouse, not just the help window---it's too much
    trouble trying to identify the help window.

How about if you assume that the most recently displayed window
is the help window?