bug#74616: 30.0.92; tmm always displays the *Completions* buffer

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Daniel Mendler <mail@daniel-mendler.de>,  74616@debbugs.gnu.org
> Date: Sat, 30 Nov 2024 13:55:02 -0500
> 
> > I think the automatic detection is a better default behavior, but
> > maybe we could have a variable (not necessarily a defcustom) for users
> > who would like to have the old behavior.
> > Stefan, WDYT?
> 
> I often use the standard UI and I generally don't like this eagerness to
> display *Completions*, so I'd either change the code not to auto-display
> the buffer (what I have done locally) or at least offer a variable
> for that.
> 
> So it seems like the var should have 3 settings: always show, never
> show, and "guess" (tho maybe we can skip the "guess" option and let the
> other completion UIs set the var to nil).

Daniel, would you like to submit the patch with these changes?