/usr/share/applications/screensavers/stonerview.desktop is in xscreensaver-gl 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=StonerView
Exec=/usr/lib/xscreensaver/stonerview -root
TryExec=/usr/lib/xscreensaver/stonerview
Comment=Chains of colorful squares dance around each other in complex spiral patterns. Inspired by David Tristram's `electropaint' screen saver, originally written for SGI computers in the late 1980s or early 1990s. Written by Andrew Plotkin.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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