bug#43572: Feature request: make it possible to choose whether the first lines of the minibuffer should be displayed instead of the last ones

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 23 Sep 2020 20:15:54 +0000
> From: Gregory Heytings <ghe@sdf.org>
> cc: 43572@debbugs.gnu.org
> 
> >> I can't think of such unintended consequences.  In the use case of 
> >> displaying completion candidates, this (the fact that it affects all 
> >> successive calls to resize_mini_window) is indeed what is wanted.
> >
> > Well, I _can_ think of such consequences.  As I said, resize_mini_window 
> > is called in many situations that don't involve completion, so setting 
> > that variable to affect all of them is a bad idea.  We need something 
> > more fine-grained if we want to implement such a feature.
> >
> 
> It would be very helpful if you could clarify what the consequences you 
> think of are.

Just grep the sources for the callers of resize_mini_window, and you
will see what I mean.  It is not safe to avoid affecting them using
the techniques you propose.  The text itself should request such
special treatment.