gistfile1.rb

class Capybara::Selenium::Driver < Capybara::Driver::Base
  def resynchronize
    yield
    if options[:resynchronize]
      Capybara.timeout(options[:resynchronization_timeout], self, "failed to resynchronize, ajax request timed out") do
        !ajaxing?
      end
    end
  end

  private

  def ajaxing?
    evaluate_script "$.active > 0"
  end
end