Comment by piekvorst

This reminds me of an excerpt from an old Emacs manual:

    . . . if you forget which commands deal with windows, just type @b[ESC-?]@t[window]@b[ESC].

This weird command is presented with such a benevolent innocence as if it's the simplest thing in the world.

I think the better advice for command-line editing would be to set up the mouse.