Re: query-replace in isearch (was Re: should search ring contain duplicates?)

[Richard Stallman]

    > I agree that a global variable seems like a good solution,
    > but calling it `history-length' seems counterintuitive.
    > I suggest calling it `history-dont-add'.

    This name is too limited and has no room for extensions.
    What do you think about `history-keep' with values `none', `all',
    and possibly other values like `empty', `duplicate', `last' (to not compare
    with the last element before adding a new one) or combinations of them?

I don't mind using a variable name that opens the room for other extensions,
but we don't need those other extensions now.  So please call it
`history-add-new-input', and initially just define the values t and nil.