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From: Lennart Borgman <lennart.borgman.073@student.lu.se>
Newsgroups: gmane.emacs.devel
Subject: Canceling dialogues
Date: Mon, 31 Jul 2006 19:38:15 +0200
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Xref: news.gmane.org gmane.emacs.devel:57856
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If you use the menus in Emacs to call a function and this function for 
example calls y-or-n-p then a popup dialog will be shown (if 
use-dialog-box is t). This dialog box can not be canceled, at least not 
on w32.

I think this is a bug and that a third alternative for canceling should 
be added.