MAGETWO-70062: Product price filter in admin shows incorrect product amount

  - Create separate product collection with customizations for Product Grid rendering
  - Use left join to price index to avoid unexpected filtration by product status in the Product Grid
  - Use CollectionFactory customized through virtual type for Product Grid rendering in order to avoid interface change for Product data provider

Author: igrybkov

app/code/Magento/Catalog/Ui/DataProvider/Product/Collection.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Catalog\Ui\DataProvider\Product;
+
+/**
+ * Collection which is used for rendering product list in the backend.
+ *
+ * Used for product grid and customizes behavior of the default Product collection for grid needs.
+ */
+class Collection extends \Magento\Catalog\Model\ResourceModel\Product\Collection
+{
+    /**
+     * Join Product Price Table using left-join
+     *
+     * Customizes how price index joined to product collection in order to show disabled products in the list.
+     * It's needed as price index by its nature contains only values for enabled products.
+     * However, product grid requires to show all available products without any implicit filtering.
+     *
+     * @codeCoverageIgnore
+     * @return \Magento\Catalog\Model\ResourceModel\Product\Collection
+     */
+    protected function _productLimitationJoinPrice()
+    {
+        return $this->_productLimitationPrice(true);
+    }
+}

app/code/Magento/Catalog/etc/adminhtml/di.xml

@@ -77,6 +77,11 @@
     <type name="Magento\Catalog\Model\ResourceModel\Attribute">
         <plugin name="invalidate_pagecache_after_attribute_save" type="Magento\Catalog\Plugin\Model\ResourceModel\Attribute\Save" />
     </type>
+    <virtualType name="\Magento\Catalog\Ui\DataProvider\Product\CollectionFactory" type="\Magento\Catalog\Model\ResourceModel\Product\CollectionFactory">
+        <arguments>
+            <argument name="instanceName" xsi:type="string">\Magento\Catalog\Ui\DataProvider\Product\Collection</argument>
+        </arguments>
+    </virtualType>
     <type name="Magento\Catalog\Ui\DataProvider\Product\ProductDataProvider">
         <arguments>
             <argument name="addFieldStrategies" xsi:type="array">
@@ -85,6 +90,7 @@
             <argument name="addFilterStrategies" xsi:type="array">
                 <item name="store_id" xsi:type="object">Magento\Catalog\Ui\DataProvider\Product\AddStoreFieldToCollection</item>
             </argument>
+            <argument name="collectionFactory" xsi:type="object">\Magento\Catalog\Ui\DataProvider\Product\CollectionFactory</argument>
         </arguments>
     </type>
     <type name="Magento\Catalog\Model\Product\Action">