bug#6192: 24.0.50; eldoc-mode: unexpected recentering

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: 6192@debbugs.gnu.org
> Date: Fri, 14 May 2010 23:44:06 +0200
> 
> > Anyway, from what you say it sounds like the message displayed by
> > eldoc-mode in the echo area, which causes redisplay, somehow makes
> > Emacs think the window where you have the Lisp file needs to be
> > recentered because point is in a line that is not visible enough.
> 
> Ah, your reference to the Eldoc message made me take another look, and I
> think I've now found a pattern: the recentering appears to happen only
> (and always) when the message is displayed, and then the minibuffer
> expands to and remains at two lines, even though the message is a single
> line.

When that happens, do you see any message in *Messages* besides the
one displayed in the echo area?

In general, a single-line message should not resize the echo area.  If
the echo area is resized, then recentering you describe is a normal
reaction of the display engine.  So the question now is why the echo
area is enlarged to 2 lines.