OS X: "command-shift-" shortcuts read as "command-"

[Thomas Kjosmoen]

Hi everybody,

I'm having problems with shortcuts in Emacs in OS X 10.4 Tiger. When  
I enable the mac-command-key-is-meta feature, Emacs doesn't  
understand the command-shift-* shortcuts. For instance, I run this:

(setq mac-command-key-is-meta nil)
(require 'redo)
(global-set-key [(alt z)] 'undo)
(global-set-key [(alt shift z)] 'redo)

This binds the keyboard shortcuts correctly, but Emacs doesn't
understand it. However, if I bind shortcuts with meta and shift,
those work just fine. Checking both the A-z and the A-S-z shortcuts
with C-h k, BOTH give me this message:

------->8-------
A-z runs the command undo
    which is an interactive compiled Lisp function in `redo'.
It is bound to C-_, A-z, <undo>, C-/, <menu-bar> <edit> <undo>.
(undo &optional arg)

Undo some previous changes.
Repeat this command to undo more changes.
A numeric argument serves as a repeat count.
--------8<--------

It simply seems like Emacs doesn't even see that there is a
difference between A-z and A-S-z. Do anyone on this mailing list have
any ideas of how to fix this?

Best regards,
Thomas Kjosmoen