[bug] Visualizer disappears on resizing window for published topology

[pandafy]

Steps to replicate

1. Create a network topology
2. Open http:127.0.0.1:8000/topology/ and click on the topology created in above step
3. Resize the browser window

Expected Result
The topology visualizer appears in the resized window

Actual Result
The webpage becomes blank

network-topology-published-topology.mp4

[pandafy]

Remove this workaround after fixing this bug

openwisp-network-topology/openwisp_network_topology/tests/test_selenium.py

Lines 38 to 59 in 8d22f53

	@classmethod
	def setUpClass(cls):
	super().setUpClass()
	cls.web_driver.quit()
	# Workaround for https://github.com/openwisp/openwisp-network-topology/issues/193
	# The "automation" info-bar causes the visualizer to error.
	# TODO: Remove this when the bug is fixed.
	chrome_options = webdriver.ChromeOptions()
	if getattr(settings, 'SELENIUM_HEADLESS', True):
	chrome_options.add_argument('--headless')
	chrome_options.add_argument('--window-size=1366,768')
	chrome_options.add_argument('--ignore-certificate-errors')
	chrome_options.add_argument('--remote-debugging-port=9222')
	# Disable the info-bar in chrome browser
	chrome_options.add_experimental_option("useAutomationExtension", False)
	chrome_options.add_experimental_option("excludeSwitches", ["enable-automation"])
	capabilities = DesiredCapabilities.CHROME
	capabilities['goog:loggingPrefs'] = {'browser': 'ALL'}
	cls.web_driver = webdriver.Chrome(
	options=chrome_options,
	desired_capabilities=capabilities,
	)