bug#43519: 28.0.50; Overlay at end of minibuf hides minibuf's real content

[Gregory Heytings]

[I send this mail again, apparently it was not delivered.  I apologize if 
you receive it twice.]

> > Which is why my proposal is to not break anything, but only to give 
> > applications the control of how what they insert in the minibuffer is 
> > displayed.  A start_display_at_beginning_of_minibuffer variable that 
> > would be reset in read_minibuf() and that an application could set in 
> > minibuffer-setup-hook.  I don't understand why you would be opposed to 
> > such a change.
>
> Because it changes a long-standing behavior with inserting normal text 
> into the minibuffer.

I does not change anything.  Unless the user (in this case, the developer 
of completion applications such as icomplete or ido or ...) chooses to use 
that new possibility.

> This is not the user, this is a Lisp program that will do it.  The 
> behavior will change in that the user will be shown only the first part 
> of the text, as opposed to the last part we were showing until now.

The behavior will not change unless the developer (who presumably knows 
what they are doing) requests it to change.

> Maybe such a change in behavior is desirable (I'm not sure, and I don't 
> yet have a clear idea how will Lisp programs decide which behavior to 
> request), but it's a separate issue.

Okay, so shall I file another bug just to have this same discussion again?