This file is indexed.

/usr/share/xscreensaver/config/voronoi.xml is in xscreensaver-gl 5.36-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="voronoi" _label="Voronoi" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=hD_8cBvknUM"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Slow" _high-label="Fast"
            low="0" high="100000" default="20000"
            convert="invert"/>

    <number id="points" type="slider" arg="-points %"
            _label="Points" _low-label="Few" _high-label="Many"
            low="1" high="100" default="25"/>

    <number id="pointSize" type="slider" arg="-point-size %"
            _label="Point size" _low-label="0" _high-label="50 pixels"
            low="0" high="50" default="9"/>

    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   </vgroup>

   <vgroup>
    <number id="pointSpeed" type="slider" arg="-point-speed %"
            _label="Wander speed" _low-label="Slow" _high-label="Fast"
            low="0.0" high="10.0" default="1.0"/>

    <number id="pointDelay" type="slider" arg="-point-delay %"
            _label="Insertion speed" _low-label="Slow" _high-label="Fast"
            low="0.0" high="3.0" default="0.05"
            convert="invert"/>

    <number id="zoomSpeed" type="slider" arg="-zoom-speed %"
            _label="Zoom speed" _low-label="Slow" _high-label="Fast"
            low="0.1" high="10.0" default="1.0"/>

    <number id="zoomDelay" type="slider" arg="-zoom-delay %"
            _label="Zoom frequency" _low-label="0" _high-label="60 seconds"
            low="0" high="60" default="15"/>
   </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
A Voronoi tessellation.  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.

https://en.wikipedia.org/wiki/Voronoi_diagram
https://en.wikipedia.org/wiki/Tessellation

Written by Jamie Zawinski; 2007.
  </_description>
</screensaver>