getSize() of product collection returns incorrect value after applying addAttributeToFilter()

[heyqule]

The pagination became incorrect. For example, The pagination would show 10 page when there are only 3 pages of product on product listing page.

Preconditions

Magento version 2.1.2

Steps to reproduce

1. Create a frontend plugin for product collection's load function, beforeLoad()
2. Add a new addAttributeToFitler() to $subject
3. get the value of getSize()

Expected result

1. the getSize() should reflect the total in the collection with new attribute filter.

Actual result

1. the _totalRecords is not correct for filtered collection. getSize() returns incorrect value.

Investigation:
The total records was pulled from a different model. When I added new attribute filter to the collection, it did not update the search criteria in catalogsearch models. Hence, the total records did not represent the total in the collection.

Magento\CatalogSearch\Model\ResourceModel\Fulltext\Collection::_renderFiltersBefore()
Line 347: $this->_totalRecords = $this->searchResult->getTotalCount();

[heyqule]

My current solution was to remove the above line with a function override in new extension. But I'm not sure the side effect of this change.

[daniel-ifrim]

@heyqule This issue looks related to this one #9807

[cmuench]

We have the same issue in one of our projects. I can confirm that the "getSize" method contains no own filter. So the "getCount" method returns a different value than the "getSize" method.

[magento-engcom-team]

@heyqule, thank you for your report.
The issue is already fixed in develop branch, 2.2.0