This file is indexed.

/usr/share/xscreensaver/config/glslideshow.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="glslideshow" _label="GLSlideshow" gl="yes">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=Hi0xUWnqBhQ"/>

  <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="duration" type="slider" arg="-duration %"
           _label="Time until loading a new image"
           _low-label="10 seconds" _high-label="5 minutes"
           low="10" high="300" default="30"/>

   <number id="zoom" type="slider" arg="-zoom %"
           _label="Always show at least this much of the image"
           _low-label="50%" _high-label="100%"
           low="50" high="100" default="75"/>

   <number id="pan" type="slider" arg="-pan %"
           _label="Pan/zoom duration"
           _low-label="1 second" _high-label="30 seconds"
           low="1" high="30" default="6"/>

   <number id="fade" type="slider" arg="-fade %"
           _label="Crossfade duration"
           _low-label="None" _high-label="30 seconds"
           low="0" high="30" default="2"/>
   </vgroup>
   <vgroup>

    <boolean id="letterbox" _label="Letterbox" arg-unset="-no-letterbox"/>
    <boolean id="titles" _label="Show file names" arg-set="-titles"/>
    <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

    <xscreensaver-image />

    <xscreensaver-updater />

   </vgroup>
  </hgroup>

  <_description>
Loads a random sequence of images and smoothly scans and zooms around
in each, fading from pan to pan.  

Written by Jamie Zawinski and Mike Oliphant; 2003.
  </_description>
</screensaver>