{% if source_filter %}<input type="hidden" name="source" value="{{ source_filter }}">{% endif %}
{% if request.GET.sync_page %}<input type="hidden" name="sync_page" value="{{ request.GET.sync_page }}">{% endif %}
{% if request.GET.sync_per_page %}<input type="hidden" name="sync_per_page" value="{{ request.GET.sync_per_page }}">{% endif %}
{% for key, value in request.GET.items %}
  {% if key|slice:":3" == "sf_" %}
  <input type="hidden" name="{{ key }}" value="{{ value }}">
  {% endif %}
{% endfor %}