[BUG] Screen turn off no matter what when there's no user input before the set time

[Zakadius123]

Having "Turn off the screen after" in the power saving settings enabled (any set time other than 'never') will cause the screens to turn off even when a full screen video or a game is playing unless the user uses their mouse or keyboard at least once before it starts dimming.

[ids1024]

cosmic-idle should handle screensaver inhibition: https://github.com/pop-os/cosmic-idle/blob/master/src/freedesktop_screensaver.rs. (There are a couple protocols for screesaver inhibition; xdg-desktop-portal wraps this with the inhibit portal.)

I think videos in Firefox were inhibiting screensavers properly when I tested it. VLC should work too.

[jokeyrhyme]

Relates to #172