This file is indexed.

/usr/share/xscreensaver/config/flipflop.xml 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.

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

<screensaver name="flipflop" _label="FlipFlop" gl="yes">

  <command arg="-root"/>

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

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

    <number id="spin" type="slider" arg="-spin %"
            _label="Spin" _low-label="Stopped" _high-label="Whirlwind"
            low="0" high="3.0" default="0.1"/>
   </vgroup>
   <vgroup>

    <select id="mode">
      <option id="tiles"  _label="Draw Tiles"/>
      <option id="sticks" _label="Draw Sticks" arg-set="-mode sticks"/>
    </select>

     <number id="size-x" type="spinbutton" arg="-size-x %"
             _label="Width" low="3" high="20" default="9"/>
     <number id="size-y" type="spinbutton" arg="-size-y %"
             _label="Depth" low="3" high="20" default="9"/>
   </vgroup>
  </hgroup>

  <hgroup>
   <vgroup>
    <boolean id="texture" _label="Load image"      arg-set="-texture" />
    <boolean id="wire"    _label="Wireframe"       arg-set="-wireframe"/>
    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   </vgroup>
   <vgroup>
    <xscreensaver-image />
   </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
Colored tiles swap with each other.

Written by Kevin Ogden and Sergio Gutierrez; 2003.
  </_description>
</screensaver>