This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.gthumb.image-viewer.gschema.xml is in gthumb-data 3:3.3.1.is.3.2.7-0ubuntu1.

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"?>
<schemalist>

  <schema path="/org/gnome/gthumb/image-viewer/" id="org.gnome.gthumb.image-viewer">
    <key name="zoom-quality" enum="org.gnome.gthumb.GthZoomQuality">
      <default>'low'</default>
    </key>
    <key name="zoom-change" enum="org.gnome.gthumb.GthZoomChange">
      <default>'fit-size-if-larger'</default>
    </key>
    <key name="transparency-type" enum="org.gnome.gthumb.GthTranspType">
      <default>'none'</default>
      <description>Possible values are: white, black, checked, none.</description>
    </key>
    <key type="b" name="reset-scrollbars">
      <default>true</default>
      <description>Whether to reset the scrollbars position after changing image</description>
    </key>
    <key name="check-type" enum="org.gnome.gthumb.GthCheckType">
      <default>'midtone'</default>
    </key>
    <key name="check-size" enum="org.gnome.gthumb.GthCheckSize">
      <default>'medium'</default>
    </key>
  </schema>

</schemalist>