Re: Problems with non-zero scroll-margin

[Richard M. Stallman]

    at least broke scrolling of articles with <RET> in Gnus and makes
    using GDB in Emacs (gud-mode) very inconvenient if the value of
    `scroll-margin' is non-zero.

I don't use GNUS and I cannot test it.  The crucial question is,
is Emacs redisplay behaving incorrectly, or is Gnus using it wrong?

    (progn
      (setq scroll-margin 1)
      (pop-to-buffer (get-buffer-create "*test*"))
      (dotimes (i 100) (insert (number-to-string i) "\n"))
      (goto-char (point-min))
      (scroll-up 1)
      (move-to-window-line 0))

    You should see that point will not be placed on the first window line
    but in the middle of the window.

That's exactly what the scroll margin is supposed to do: not let point
end up in the specified margin.  So I don't think there is a bug.