Adding a binding for 'undo-redo'

[Dmitry Gutov]

Hi all,

This discussion has been living in a subthread, but I think it deserves 
a separate one, for all to see.

The main technical hurdle to adding this binding was the lack of a good 
binding, but Richard suggested C-? and C-M-_, which should cover both 
GUI Emacs and tty. This change doesn't change the existing 'undo' 
binding, so it's not going to break anybody's workflow. But it adds a 
key combination we can recommend to the users who are accustomed to 
separate 'undo' and 'redo' commands.

WDYT? Should we add this to Emacs 28?

A follow-up patch could add 'undo-redo' to cua-mode as well.

undo-redo-bindings.diff
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