This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.gthumb.comments.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/comments/" id="org.gnome.gthumb.comments">
    <key type="b" name="synchronize">
      <default>true</default>
    </key>
  </schema>
  
</schemalist>