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

[Gregory Heytings via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@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.
>

I did this.  There are only seven calls to resize_mini_window().

>
> It is not safe to avoid affecting them using the techniques you propose.
>

Could you please provide a recipe which would demonstrate a problem with 
the technique I propose?  AFAICS, the flag is reset immediately when 
read_minibuf() / read-from-minibuffer has ended.