{#
    Renders query parameters as hidden inputs so they survive a filter submit.

    A filter form only submits its own fields, so anything else that describes the current list —
    the sorting, the page size, the return URL — has to be carried along explicitly or it is lost
    the moment somebody searches.
#}
{% macro render(values, prefix) %}
    {%- for key, value in values -%}
        {%- set name = prefix ? prefix ~ '[' ~ key ~ ']' : key -%}
        {%- if value is iterable -%}
            {{ _self.render(value, name) }}
        {%- else -%}
            <input type="hidden" name="{{ name }}" value="{{ value }}">
        {%- endif -%}
    {%- endfor -%}
{% endmacro %}