This file is indexed.

/usr/share/gnome-applets/ui/brightness-applet-menu.xml is in gnome-applets-data 3.28.0-1.

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

The actual contents of the file can be viewed below.

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<section>
	<item>
		<attribute name="label" translatable="yes">_About</attribute>
		<attribute name="action">brightness.about</attribute>
	</item>
</section>