keep device screen off

[yukulele]

• I have checked that a similar feature request does not already exist.

Is your feature request related to a problem? Please describe.
I use the "--turn-screen-off" option, but sometimes an event (like an incoming call for example) turns it back on.

Describe the solution you'd like
add a --keep-screen-off option

or

make the --turn-screen-off option keep the screen always off.

Describe alternatives you've considered
I use the Turn device screen off MOD+o shortcut on incoming call.

[rom1v]

AFAIK, there is no way to "keep" it off.

A workaround has been implemented to turn it off on power button (from scrcpy, see cf9d449 #1573 #1577), but that's all.

Other events may turn the screen on without scrcpy being aware of it.