just tested & have this issue in 19.04 (LXQt desktop & vlc) in `vlc` i had 'disable screensaver' ticked, but xscreensaver still hid vlc (both when vlc was playing in a window, or was fullscreen)
due to [a requested] test earlier today i was using an old version of xscreensaver when I first tried, ie. xscreensaver: Installed: 5.36-1ubuntu1 *** 5.36-1ubuntu1 500 500 http://old-releases.ubuntu.com/ubuntu zesty/universe amd64 Packages i then closed vlc, and upgraded to the standard disco (19.04) version of xscreensaver. i restarted the xscreensaver daemon & re-tested, again vlc was overwritten [on display] by xscreensaver // following [trimmed] output was after xscreensaver was back to 19.04's default version guiverc@d960-ubu2:~$ apt-cache policy vlc xscreensaver vlc: Installed: 3.0.6-1 *** 3.0.6-1 500 500 http://ftp.iinet.net.au/pub/ubuntu disco/universe amd64 Packages xscreensaver: Installed: 5.42+dfsg1-1ubuntu1 *** 5.42+dfsg1-1ubuntu1 500 500 http://ftp.iinet.net.au/pub/ubuntu disco/universe amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1790110 Title: Xscreensaver overrides vlc smplayer and caffeine To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xscreensaver/+bug/1790110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs