bug#1305: All code that currently beeps should use visual bell instead

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Gregory Heytings <gregory@heytings.org>,
>   jasonspiro4@gmail.com,  1305@debbugs.gnu.org,  monnier@iro.umontreal.ca
> Date: Sat, 17 Apr 2021 15:39:04 +0200
> 
> > It is my understanding that Emacs is unusual in using the system bell
> > though.  It would be better to avoid it completely, even when that
> > setting is on.
> 
> I turned the volume up, and saying "lTAB" in the shell (in a Console
> window) then beeped audibly.  So the default here is to make sounds.
> And I just checked the same on my Apple laptop -- the shell there also
> beeps a lot.

That is my experience as well: programs make sounds nowadays all the
time, and one needs to customize the system to make them shut up.