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

[Gregory Heytings]

> Have you read the comments?

Of course I did.

> People complain about macOS behavior, and the first proposed "fix" was 
> to make it work close to how it works on GNU/Linux (except flashing the 
> mode-line, probably because that is easier to implement).

And the fix used by the author of the issue, and agreed with by the one 
who suggested that "first proposed fix", is to turn visible-bell off.

Anyway, I fear this discussion will never end.  I proposed a patch, I'd 
suggest you propose another one that does what you think would be TRT.