array $response, WP_Customize_Selective_Refresh $this, array $partials )
Filters the response from rendering the partials.
Plugins may use this filter to inject
$styles, which are dependencies for the partials being rendered. The response data will be available to the client via the
render-partials-response JS event, so the client can then inject the scripts and styles into the DOM if they have not already been enqueued there.
If plugins do this, they’ll need to take care for any scripts that do
document.write() and make sure that these are not injected, or else to override the function to no-op, or else the page will be destroyed.
Plugins should be aware that
$styles may eventually be included by default in the response.
(array) Associative array mapping a partial ID its corresponding array of contents for the containers requested.
(array) List of errors triggered during rendering of partials, if
(WP_Customize_Selective_Refresh) Selective refresh component.
(array) Placements' context data for the partials rendered in the request. The array is keyed by partial ID, with each item being an array of the placements' context data.