[bidi] 2 bidi bugs

[Hicham Amaoui <amaoui altern org>]

Hello,
I found this 2 bugs when trying Gnome2 with arabic:
- characters are not connected when there's an Accel in the string.
- when using RTL mode, I still must click on the left of the screen
to get the Application menu displayed.

Here's 2 screenshots which show this:
http://amaoui.free.fr/gnome2/images/gnome2.jpeg
http://amaoui.free.fr/gnome2/images/rtl_gnome.jpeg

Regards,
Hicham