This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.gnome-flashback.desktop-background.gschema.xml is in gnome-flashback-common 3.28.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<schemalist gettext-domain="gnome-flashback">
  <schema id="org.gnome.gnome-flashback.desktop-background" path="/org/gnome/gnome-flashback/desktop-background/">
    <key name="fade" type="b">
      <default>true</default>
      <summary>Fade the background on change</summary>
      <description>If set to true, then fade effect will be used to change the desktop background.</description>
    </key>
  </schema>
</schemalist>