Category.php

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<?php
namespace Magento\CatalogRule\Plugin\Indexer;

use Magento\CatalogRule\Model\Indexer\Product\ProductRuleProcessor;

class Category
{
    protected $productRuleProcessor;

    public function __construct(
        ProductRuleProcessor $productRuleProcessor
    ) {
        $this->productRuleProcessor = $productRuleProcessor;
    }

    public function afterSave(
        \Magento\Catalog\Model\Category $subject,
        \Magento\Catalog\Model\Category $result
    ) {
        $productIds = $result->getChangedProductIds();
        if (!empty($productIds) && !$this->productRuleProcessor->isIndexerScheduled()) {
            $this->productRuleProcessor->reindexList($productIds);
        }
        return $result;
    }

    public function afterDelete(
        \Magento\Catalog\Model\Category $subject,
        \Magento\Catalog\Model\Category $result
    ) {
        $this->productRuleProcessor->markIndexerAsInvalid();
        return $result;
    }
}