Ok, I understand now. Thank you so much !!
And zeroconf, sorry for hijacking your post

Hey, I'm back with another ideea )
Is it hard to create like a portable "program", that just shows a gif in a full screen, until keyboard or mouse movement is detected ?
For example I have this in "Energy Saving" script, that starts after 1 minute :
gwenview -f "Screensaver.gif"
It's a gif with some stars, in my home folder. The problem is that I always have to right click and close this gif.
I don't have much experience at coding, but is hard to make a bash script that opens a gif and close it when mouse movement is detected ?

I've created a feature request to implement the screen saver feature in KDE Plasma: https://bugs.kde.org/show_bug.cgi?id=461621 - please vote and comment more use cases!