Subtotal.php

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<?php
namespace Magento\Tax\Model\Sales\Pdf;

class Subtotal extends \Magento\Sales\Model\Order\Pdf\Total\DefaultTotal
{
    public function getTotalsForDisplay()
    {
        $store = $this->getOrder()->getStore();
        $helper = $this->_taxHelper;
        $amount = $this->getOrder()->formatPriceTxt($this->getAmount());
        if ($this->getSource()->getSubtotalInclTax()) {
            $amountInclTax = $this->getSource()->getSubtotalInclTax();
        } else {
            $amountInclTax = $this->getAmount() +
                $this->getSource()->getTaxAmount() -
                $this->getSource()->getShippingTaxAmount();
        }

        $amountInclTax = $this->getOrder()->formatPriceTxt($amountInclTax);
        $fontSize = $this->getFontSize() ? $this->getFontSize() : 7;

        if ($helper->displaySalesSubtotalBoth($store)) {
            $totals = [
                [
                    'amount' => $this->getAmountPrefix() . $amount,
                    'label' => __('Subtotal (Excl. Tax)') . ':',
                    'font_size' => $fontSize,
                ],
                [
                    'amount' => $this->getAmountPrefix() . $amountInclTax,
                    'label' => __('Subtotal (Incl. Tax)') . ':',
                    'font_size' => $fontSize
                ],
            ];
        } elseif ($helper->displaySalesSubtotalInclTax($store)) {
            $totals = [
                [
                    'amount' => $this->getAmountPrefix() . $amountInclTax,
                    'label' => __($this->getTitle()) . ':',
                    'font_size' => $fontSize,
                ],
            ];
        } else {
            $totals = [
                [
                    'amount' => $this->getAmountPrefix() . $amount,
                    'label' => __($this->getTitle()) . ':',
                    'font_size' => $fontSize,
                ],
            ];
        }

        return $totals;
    }
}