How to define shortcuts such as "A-x A-x"

I’d like to define a shortcut like this: while holding Alt, click x twice to input <b-xi>. In my-init-texmacs.scm, I use A-x A-x. The final output is correct, but the editor displays A - x after the first x is pressed. Is this the right way to define such a shortcut?

I think it is the correct way … based on the fact that A-x-x does not work.
The editor displaying A - x after the first x is pressed might be a bug.

Can you show us the command that you are using in your `my-init-teXmacs.scm"?

Sounds like this bug:
https://savannah.gnu.org/bugs/?func=detailitem&item_id=60309

("A-x A-x" "<b-xi>")

The builtin shortcut C-space works with multiple pressing of the space keys. But I didn’t find the definition of the shortcut in the scheme files.

Thanks, it looks like a bug, I’m not sure what is the origin. What happens with "S-x S-x" or other modifiers?

"S-x S-x" works just like X X . Other modifiers work like Alt .