Here are few ways to prevent

xautolock corners

see previous post

xidlehook

simply use xidlehook to launch the screensaver and use the following parameters

--not-when-audio
--not-when-fullscreen

see previous post about xautolock alternatives

caffeine

https://code.launchpad.net/~caffeine-developers/caffeine/main

currently at 2.8 version, quite no settings. The code works and detects things by its own.

Not really maintained, except lib updates and translations, there are quite no new features for years, but it works.

caffeine-ng

https://codeberg.org/WhyNotHugo/caffeine-ng

a fork from 2.4 version, the reason of the fork is explained on the repository. But to sum up, caffeine had a bunch of features and settings before the 2.4, then everything was removed because the code was supposed to be magic and solve all problems, people disagreed, so a fork was created.

gnome shell extension caffeine

https://github.com/eonpatapon/gnome-shell-extension-caffeine

not related to the others

• not maintained