Tier.php

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<?php
namespace Magento\Catalog\Block\Adminhtml\Product\Edit\Tab\Price;

class Tier extends Group\AbstractGroup
{
    protected $_template = 'Magento_Catalog::catalog/product/edit/price/tier.phtml';

    protected function _getInitialCustomerGroups()
    {
        return [$this->_groupManagement->getAllCustomersGroup()->getId() => __('ALL GROUPS')];
    }

    protected function _sortValues($data)
    {
        usort($data, [$this, '_sortTierPrices']);
        return $data;
    }

    protected function _sortTierPrices($a, $b)
    {
        if ($a['website_id'] != $b['website_id']) {
            return $a['website_id'] < $b['website_id'] ? -1 : 1;
        }
        if ($a['cust_group'] != $b['cust_group']) {
            return $this->getCustomerGroups($a['cust_group']) < $this->getCustomerGroups($b['cust_group']) ? -1 : 1;
        }
        if ($a['price_qty'] != $b['price_qty']) {
            return $a['price_qty'] < $b['price_qty'] ? -1 : 1;
        }

        return 0;
    }

    protected function _prepareLayout()
    {
        $button = $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        )->setData(
            ['label' => __('Add Price'), 'onclick' => 'return tierPriceControl.addItem()', 'class' => 'add']
        );
        $button->setName('add_tier_price_item_button');

        $this->setChild('add_button', $button);
        return parent::_prepareLayout();
    }
}