Re: Changes for emacs 28

[Dmitry Gutov]

On 14.09.2020 06:51, Richard Stallman wrote:
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> [[[ whether defending the US Constitution against all enemies,     ]]]
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>
>    >  > (The bindings for undo ensure it can be typed with just one
>    >  > shift key on all usual terminals.)
>
>    > C-_, one of the two existing bindings for 'undo', has the exact same
>    > problem.
>
> Not on a tty.  On a tty you can type Ctrl-minus and you get that
> character.

Interesting. I never would have guessed.

> Undo has two 1-key bindings, C-_ for ttys and C-/ for consoles with
> the full space of input characters.  Each requires just one shift key
> on the consoles it is meant for.

I see. There is certain elegance in that, but I'd say it's not very 
discoverable. Especially when you get C-_ by typing Ctrl-/ in xterm, but 
you need to press Ctrl-- in a tty. And with a yet another behavior in X.

Going back to the proposed bindings for 'redo', a certain popular 
package we have seen mentioned in this discussion uses them (undo-tree). 
So they have been proven in the field, for many years.

Most new users might prefer to see C-z for undo and C-S-z for redo, of 
course, but I don't think we can do anything about that, other than add 
a C-S-z binding to cua-mode.