This file is indexed.

/usr/share/xscreensaver/config/fontglide.xml is in xscreensaver-data-extra 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="fontglide" _label="FontGlide">

  <command arg="-root"/>

  <video href="https://www.youtube.com/watch?v=2KCXD19FHk0"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="10000"
            convert="invert"/>

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

    <number id="linger" type="slider" arg="-linger %"
            _label="Page linger" _low-label="Brief" _high-label="Long"
            low="0.1" high="10.0" default="1.0"/>

    <select id="mode">
     <option id="page"   _label="Pages of text"  arg-set="-mode page"/>
     <option id="scroll" _label="Horizontally scrolling text" arg-set="-mode scroll"/>
     <option id="random" _label="Random display style"/>
    </select>

    <hgroup>
     <number id="bw" type="spinbutton" arg="-bw %"
              _label="Font border thickness" low="0" high="8" default="2"/>
    </hgroup>
   </vgroup>

   <vgroup>
    <xscreensaver-text />
    <hgroup>
     <boolean id="trails" _label="Vapor trails"    arg-set="-trails"/>
     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
    </hgroup>
   </vgroup>
  </hgroup>

  <xscreensaver-updater />

  <_description>
Puts text on the screen using large characters that glide in from the
edges, assemble, then disperse.  Alternately, it can simply scroll whole 
sentences from right to left.  

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