bug#12093: 24.1; ask-user-about-supersession-threat doesn't bind <ESC> <ESC> or <ESC> <ESC> <ESC>

[Chong Yidong]

Richard Copley <rcopley@gmail.com> writes:

> If you're stuck in ask-user-about-supersession-threat's read loop, you
> can hit ESC as many times as you like and it doesn't quit out of the
> loop. This can be very annoying as it forces you to stop and work out
> what state you've got into.
>
> See D.2 (Key Binding Conventions) in the Emacs Lisp manual:
>    * Anything that acts like a temporary mode or state that the user can
>      enter and leave should define `<ESC> <ESC>' or `<ESC> <ESC> <ESC>'
>      as a way to escape.

Fixed in trunk, thanks for the bug report.