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

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Is that really true?  I see in the code that we do support
> visible-bell on TTY frames if terminfo says the terminal is capable of
> doing that, see term.c:tty_ring_bell.

I tried in both Console and xterm on this Debian/bullseye system, and
`C-g' doesn't do anything visible to me with `visible-bell' switched
on...

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