title: Cucumber-Capybara: save_screenshot(path, full: true) is not capturing the full browser?
body: <p>I'm using the latest Chrome browser, Version 57.0.2987.133 (64-bit), with the latest chromedriver v2.29 (although I've tried with Chrome 56 and chromedriver 2.27 as well) and I've got a problem where I am not able to capture the full browser when a test fails.</p>
  
  <p>This is the code I've got on my env.rb file:</p>
  
  <pre><code>Capybara::Screenshot.register_driver(:chrome) do |driver, path|
    driver.browser.save_screenshot(path, full: true)
  end
  </code></pre>
  
  <p>However, the screenshots I am getting are just a partial part, what I can see on the screen rather than the complete browser.</p>
  
  <p>Any idea if I'm doing something wrong or if I can try something different?</p>
  
  <p>Thank you!</p>