bug#2822: 23.0.91; Mode-line minor mode menu is too small

Hi,

this is a bug report which should be easy to fix. Steps to reproduce:

- Maximize your Emacs frame
- Maximize a buffer window within that frame
- Left click on the Major mode in the mode line and you will see its menu
- Left click on a Minor mode in the mode line and you won't see the
menu because it is too small

It seems the algorithms used to display the Major mode's menu and the
minor mode's menu are different. The one of the minor mode does not
work well because the top of the new menu is always aligned with the mode
line even if there is not enough space.

-- 
Damien Cassou
http://damiencassou.seasidehosting.st