bug#60616: 30.0.50; C-M-% never worked on German keyboard

[Jim Porter]

On 1/6/2023 4:07 PM, Jean Louis wrote:
> Regular expression search invokation by using key binding C-M-% never worked on 
> this German keyboard. I don't remember it ever worked.
>
> C-h k on C-M-% read no key, there is no report, nothing, it cannot detect it.
>
> I can use M-% without problem.

Does "ESC C-%" (or I guess you could spell it "ESC C-S-5") work?

As I recall, on some keyboard layouts, trying to do C-M-<foo> doesn't 
work as a keybinding, since C-M- is reserved for inputting special 
characters.