Re: Suggestion: C-x C-u => undo-only

[Richard Stallman]

    Also undo-more can be tought of as "bigger undo" (it takes larger steps
    sometimes to skip over some redo/undo pairs), so it makes sense to bind it
    to a bigger letter.

I don't want to think of it that way.  I do not think we need a key
binding for this command, and certainly don't want to introduce
unpleasant or unusual kinds of keybindings in order to make one.

Let's let this drop.