Add 'Default Filters' and 'Clear Filters' buttons to new grid filters form.

tailbone/views/master.py

@@ -71,6 +71,12 @@ class MasterView(View):
         returns the full page.
         """
         grid = self.make_grid()
+
+        # If user just refreshed the page with a reset instruction, issue a
+        # redirect in order to clear out the query string.
+        if self.request.GET.get('reset-to-default-filters') == 'true':
+            return self.redirect(self.request.current_route_url(_query=None))
+
         if self.request.params.get('partial'):
             self.request.response.content_type = b'text/html'
             self.request.response.text = grid.render_grid()