[down] after (move-to-window-line -1) does not scroll

[Ehud Karni]

In GNU Emacs 21.1.30.1 (i686-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-11-02 on beta
configured using `configure  --host=i686-redhat-linux-gnu --with-pop 
--with-x-toolkit=athena'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The command (move-to-window-line -1) should go to the last line of
the window. It does so where all the lines have the same character
height. In RMAIL mode I have the subject displayed in enlarged font. 
In this mode (move-to-window-line -1) goes to 1 line before the last
(presumably because the bottom part of the last line is not visible).

You can check it with the *Faces* buffer (list-faces-display) where
the fonts have different heights ( Info-title-*-face and others).

The real problem comes when I press [down], instead of scrolling half
screen (scroll-step = 0, scroll-conservatively = 0), the screen scrolls
a fraction of a line and only the next [down] does the real scrolling.

I don't mind that (move-to-window-line -1) goes to the last fully seen
line of the window. What I want is that the next [down] will DTRT -
scroll half screen up.

Ehud.


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