This file is indexed.

/usr/share/xscreensaver/config/slidescreen.xml is in xscreensaver-data 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="slidescreen" _label="SlideScreen">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=uKNE4xCdlno"/>

  <hgroup>
   <vgroup>
   <number id="delay" type="slider" arg="-delay %"
           _label="Frame rate" _low-label="Low" _high-label="High"
           low="0" high="100000" default="50000"
           convert="invert"/>

   <number id="delay2" type="slider" arg="-delay2 %"
          _label="Pause" _low-label="Short" _high-label="Long"
          low="0" high="2000000" default="1000000"/>

   <number id="duration" type="slider" arg="-duration %"
           _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
           low="10" high="600" default="120"/>

    <xscreensaver-image />

   </vgroup>
   <vgroup>
   <number id="increment" type="slider" arg="-increment %"
           _label="Slide speed" _low-label="Slow" _high-label="Fast"
           low="1" high="30" default="10"/>

   <number id="grid-size" type="slider" arg="-grid-size %"
          _label="Cell size" _low-label="Small" _high-label="Large" 
          low="12" high="500" default="70"/>

   <number id="ibw" type="spinbutton" arg="-ibw %"
          _label="Gutter size" low="0" high="50" default="4"/>

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

   <xscreensaver-updater />

   </vgroup>
  </hgroup>

  <_description>
A variant on a "fifteen puzzle", operating on the screen or an image.
It divides the image into a grid and randomly shuffles the squares.

https://en.wikipedia.org/wiki/Fifteen_puzzle

Written by Jamie Zawinski; 1994.
  </_description>
</screensaver>