Re: history-delete-duplicates and keep-all

[Richard M. Stallman]

    Currently `keep-all' is used only in `query-replace'.  So it is not
    too late to let-bind `history-delete-duplicates' in this place instead.
    ...
    Thus `history-delete-duplicates' should support three different values:

We could do that, or make a separate variable.
I think a separate variable would be better, because
these two different activities are for different purposes.

Which means it is really a question of whether to use
an argument for this, or a new global variable.

      This arg also has
    another drawback: it is available only to one completion function
    `read-from-minibuffer' and is not available to all other completion
    functions.

I think that is a reason to switch to a variable.
Would you please make that change?

Please update NEWS and the Lisp manual, too.