Magento2 - Filter product collection by SKU is not affecting layer navigation

Question

I am filtering the product collection in ListProduct.php using below code

// Sample sku array
$skuarray=array('sku1', 'sku2', 'sku3');

$this->_productCollection = $layer->getProductCollection()->addAttributeToFilter('sku', array('in' => $skuarray));

Now i am getting a list of products filtered by SKU in my view but, Layer navigation is still displaying the all filters(attributes) which is in category.

For example:
Category having 20 products, 
i am filtering only 3 products by using sku filters,
Products are displaying filtered 3 products
But Left side Layer Navigation Displaying filters for 20 products i.e category is having

Answer 1

You can try override initializeProductCollection function,

add your filter before catalog_block_product_list_collection event.

effect from catalog_block_product_list_collection

Answer 2

I didn't examine layered nav in M2 yet but if it works like in M1 your issue could depend on the fact that filters and result use two different layer instances, that access to different collection objects.

That means that your addAttributeToFilter() is applied to result collection but not to filters collection and it could explain the unexpected result you get.