This file is indexed.

/usr/share/kde4/apps/kritaplugins/histogram.rc is in krita-data 1:2.8.1-1-0ubuntu3.

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The actual contents of the file can be viewed below.

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<!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
<kpartgui library="kritahistogram" version="6">
<MenuBar>
    <Menu name="Layer"><text>&amp;Layer</text>
	<Action name="histogram" group="layer_properties_merge"/>
    </Menu>
</MenuBar>
</kpartgui>