Views AJAX arguments are not HTML decoded

Problem/Motivation

The JavaScript Views arguments setting (views.ajaxViews.views_dom_id:ID.views_args) will get HTML escaped on line 62 of the views.module file, but when passed back to Drupal via AJAX and picked up on line 117 of ViewAjaxController.php the arguments are not decoded causing issues with any arguments that contain HTML entities. For example, a Views argument of "This & That" will be "This & That" in the JavaScript settings object, but it will not get decoded when passed back to Drupal so the string "This & That" will be used instead of the original string "This & That" on any AJAX request.

Steps to reproduce (there are probably easier ways to reproduce, but this is my set up):

1. Create a entity reference field on a node of type foo like field_type_bar_nodes
2. Create a type bar node titled "This & That"
3. Create two type foo nodes with the entity reference field referencing the "This & That" node
4. Create a view page listing type foo nodes with AJAX enabled and a pager paging one node at a time
5. Add a relationship with "Content referenced from field_type_bar_nodes"
6. Configure a contextual filter using that relationship as a "Query parameter" filter
7. Go to the view page at /VIEW_URL?field_type_bar_nodes=This%20%26%20That
8. Click the next button and notice how the pager does not work as it should by showing the second node

Proposed resolution

Decode the Views arguments on re-entry into Drupal.