Re: Using AltGr as standard modifier key in emacs

[Rusi]

On Wednesday, October 14, 2015 at 11:36:26 AM UTC+5:30, Yuri Khan wrote:
> However, this comes at a cost. Because of the way modifiers work in
> Emacs when running as a GUI application, the user has no way of
> pressing e.g. C-c or C-x or M-x when a non-Latin layout is active.
> Instead, Emacs interprets the keypresses as being C- or M-modified
> letters of the active layout.

I find this behavior at least anomalous, maybe a bug.

$ setxkbmap -layout "us,gr" -option "grp:lalt_lshift_toggle,grp_led:scroll"

gets a greek keyboard after lshift-lalt

Now inside emacs the normal keys produce greek thus:
abcdefghijkl produces αβψδεφγηιξκλ

So far so good

C-a produces a 
C-α is undefined
message

However M-x (ie Alt-x) works alright

So why does C- go through the current layout
Whereas M- stays within us/Ascii?