/usr/share/applications/screensavers/voronoi.desktop is in xscreensaver-gl 5.36-1ubuntu1.
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=Voronoi
Exec=/usr/lib/xscreensaver/voronoi -root
TryExec=/usr/lib/xscreensaver/voronoi
Comment=Draws a randomly-colored Voronoi tessellation, and periodically zooms in and adds new points. The existing points also wander around. There are a set of control points on the plane, each at the center of a colored cell. Every pixel within that cell is closer to that cell's control point than to any other control point. That is what determines the cell's shapes. http://en.wikipedia.org/wiki/Voronoi_diagram Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=MATE;
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