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The ControlList::contains(const ControlId &id) function isn't used, as it has been replaced by usage of the get() function. Document get as being the preferred way to check for the presence of a control in a ControlList, and drop the contains() function. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>