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bug#2109: menu-bar-update-hook functions are unquittable

From: Glenn Morris
Subject: bug#2109: menu-bar-update-hook functions are unquittable
Date: Thu, 29 Jan 2009 22:18:58 -0500
User-agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) 
emacs -Q
(defun foo ()
  (while t))
(add-hook 'menu-bar-update-hook 'foo)

-> Emacs uses 100% CPU. C-g does not work and Emacs must be killed.


This is a problem if you have an imenu index function that misbehaves.
(For example, this is why bug#2106 is unquittable.)
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