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

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> If you put a breakpoint inside tty_ring_bell, do you see that
> tty->TS_visible_bell is non-NULL or not?  If it's non-NULL, perhaps
> the terminal emulator has that disabled somehow?

Let's see...

gdb) print tty->TS_visible_bell 
$1 = 0x555555da95c3 "\033[?5h$<100/>\033[?5l"

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