src/MetaModel.php
protected function copyFilter($objFilter)
    {
        if ($objFilter) {
            $objNewFilter = $objFilter->createCopy();
        } else {
            $objNewFilter = $this->getEmptyFilter();
        }
        return $objNewFilter;
    }
protected function copyFilter($objFilter)
    {
        if ($objFilter) {
            $objNewFilter = $objFilter->createCopy();
        } else {
            $objNewFilter = $this->getEmptyFilter();
        }
        return $objNewFilter;
    }
Clone the given filter or create an empty one if no filter has been passed.

@param IFilter|null $objFilter The filter to clone.

@return IFilter the cloned filter.