Emacs hangs! [trunk, bidi, docview]

[Angelo Graziosi]

Perhaps you already know this problem, but I want to flag it for 
completeness.

When I add

(setq-default bidi-display-reordering t)

to my ~/.emacs file causes Emacs (current trunk) to hang when I try to 
visit a PDF or JPG file (docview-mode).

This happens both on Cygwin and GNU/Linux Kubuntu 10.04.

Ciao, ciao,
Angelo.