This file is indexed.

/etc/xdg/xdg-xubuntu/xfce4/panel/default.xml is in xubuntu-default-settings 18.04.6.

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="UTF-8"?>

<channel name="xfce4-panel" version="1.0">
  <property name="panels" type="uint" value="1">
    <property name="panel-0" type="empty">
      <property name="position" type="string" value="p=6;x=0;y=0"/>
      <property name="length" type="uint" value="100"/>
      <property name="position-locked" type="bool" value="true"/>
      <property name="plugin-ids" type="array">
        <value type="int" value="1"/>
        <value type="int" value="2"/>
        <value type="int" value="3"/>
        <value type="int" value="4"/>
        <value type="int" value="5"/>
        <value type="int" value="6"/>
        <value type="int" value="7"/>
        <value type="int" value="8"/>
        <value type="int" value="9"/>
        <value type="int" value="10"/>
        <value type="int" value="11"/>
      </property>
      <property name="background-style" type="uint" value="0"/>
      <property name="background-alpha" type="uint" value="80"/>
      <property name="size" type="uint" value="24"/>
      <property name="autohide" type="bool" value="false"/>
      <property name="length-adjust" type="bool" value="true"/>
      <property name="span-monitors" type="bool" value="false"/>
      <property name="enter-opacity" type="uint" value="100"/>
      <property name="leave-opacity" type="uint" value="100"/>
      <property name="mode" type="uint" value="0"/>
    </property>
  </property>
  <property name="plugins" type="empty">
    <property name="plugin-1" type="string" value="whiskermenu"/>
    <property name="plugin-2" type="string" value="tasklist">
      <property name="flat-buttons" type="bool" value="true"/>
    </property>
    <property name="plugin-3" type="string" value="separator">
      <property name="style" type="uint" value="0"/>
      <property name="expand" type="bool" value="true"/>
    </property>
    <property name="plugin-4" type="string" value="systray">
      <property name="names-visible" type="empty"/>
      <property name="show-frame" type="bool" value="false"/>
      <property name="size-max" type="uint" value="22"/>
    </property>
    <property name="plugin-5" type="string" value="notification-plugin"/>
    <property name="plugin-6" type="string" value="indicator">
      <property name="blacklist" type="array">
        <value type="string" value="libappmenu.so"/>
      </property>
    </property>
    <property name="plugin-7" type="string" value="statusnotifier">
      <property name="icon-size" type="uint" value="22"/>
      <property name="menu-is-primary" type="bool" value="true"/>
      <property name="mode-whitelist" type="bool" value="false"/>
      <property name="single-row" type="bool" value="false"/>
      <property name="square-icons" type="bool" value="false"/>
      <property name="symbolic-icons" type="bool" value="true"/>
    </property>
    <property name="plugin-8" type="string" value="power-manager-plugin"/>
    <property name="plugin-9" type="string" value="pulseaudio">
      <property name="enable-keyboard-shortcuts" type="bool" value="true"/>
      <property name="enable-mpris" type="bool" value="true"/>
      <property name="mixer-command" type="string" value="pavucontrol"/>
      <property name="mpris-players" type="string" value="parole"/>
      <property name="show-notifications" type="bool" value="true"/>
    </property>
    <property name="plugin-10" type="string" value="separator">
      <property name="style" type="uint" value="0"/>
      <property name="expand" type="bool" value="false"/>
    </property>
    <property name="plugin-11" type="string" value="clock">
      <property name="digital-format" type="string" value="%d %b, %H:%M"/>
    </property>
  </property>
  <property name="configver" type="int" value="2"/>
</channel>