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[[ buffer-string vs. buffer-substring ]]

Here's what I see:

Emacs 20.3:     (buffer-string)
                (buffer-substring START END)

XEmacs 20.4:    (buffer-string &optional START END BUFFER)
                (buffer-substring &optional START END BUFFER)

So a compatible change would be to add an optional argument BUFFER to
the Emacs 20.3 implementation of buffer-substring.

buffer-string is more difficult, but I don't quite understand the
START and END arguments in XEmacs 20.4 here, anyway.  Either it's just
one function like XEmacs 20.4 buffer-substring, or it's two functions:

    (buffer-string &optional BUFFER)
    (buffer-substring START END &optional BUFFER)

Both ways have their merit.

Whatcha think?

kai
-- 
Life is hard and then you die.