silence audio on locked screen?

[Richard Hector <richard@walnut.gen.nz>]

Hi all,

I'm using buster with xfce4, pulseaudio, and (I think) light-locker.

When I lock my screen, audio continues to play (and system sounds are 
still heard).

This seems to me like a way to leak information, and is also annoying to 
anyone nearby. It's then annoying for me when I discover somebody has 
unplugged my headphones to make them shut up :-)

Any suggestions for making it be quiet? Perhaps a wishlist bug for 
light-locker? I don't know if it's even feasible, given the various 
combinations of audio system and screen lockers.

Cheers,
Richard