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/usr/share/glib-2.0/schemas/org.mate.thumbnailers.gschema.xml is in mate-desktop-common 1.20.1-2ubuntu1.

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<schemalist gettext-domain="mate-desktop">
  <schema id="org.mate.thumbnailers" path="/org/mate/desktop/thumbnailers/">
    <key name="disable-all" type="b">
      <default>false</default>
      <summary>Disable all external thumbnailers</summary>
      <description>Set to true to disable all external thumbnailer programs, independent on whether they are independently disabled/enabled.</description>
    </key>
    <key name="disable" type="as">
      <default>[]</default>
      <summary>List of mime-types for which external thumbnailer programs will be disabled</summary>
      <description>Thumbnails will not be created for files whose mime-type is contained in the list.</description>
    </key>
  </schema>
</schemalist>