Restore old headless globally, and activate new headless locally

It's hard to stabilize all tests with new headless

modules/bim/spec/features/bcf/api_authorization_spec.rb

@@ -128,10 +128,15 @@ def oauth_path(client_id)
 
     logout
 
-    # A basic auth alert is displayed asking to enter name and password
-    # Register some basic auth credentials
-    #   A non-matching url is used so that capybara will issue a CancelAuth instead of trying to authenticate
-    page.driver.browser.register(username: 'foo', password: 'bar', uri: /does_not_match/)
+    # A basic auth alert is displayed asking to enter name and password Register
+    # some basic auth credentials
+    # - A non-matching url is used so that capybara will issue a CancelAuth
+    #   instead of trying to authenticate
+    # - The register method is not recognized by selenium-webdriver with Chrome
+    #   120 with old headless
+    if page.driver.browser.respond_to?(:register)
+      page.driver.browser.register(username: 'foo', password: 'bar', uri: /does_not_match/)
+    end
     # While not being logged in and without a token, the api cannot be accessed
     visit("/api/bcf/2.1/projects/#{project.id}")
     # Cancel button of basic auth should have been chosen now

modules/my_page/spec/features/my/my_spent_time_widget_with_a_negative_time_zone_spec.rb

@@ -30,7 +30,7 @@
 
 require_relative '../../support/pages/my/page'
 
-RSpec.describe 'My spent time widget with a negative time zone', :js,
+RSpec.describe 'My spent time widget with a negative time zone', :chrome_headless_new, :js,
                with_settings: { start_of_week: 1 } do
   let(:beginning_of_week) { monday }
   let(:end_of_week) { sunday }

spec/support/browsers/chrome.rb

@@ -12,7 +12,20 @@ def register_chrome(language, name: :"chrome_#{language}", override_time_zone: n
       end
     else
       options.add_argument('--window-size=1920,1080')
-      options.add_argument('--headless=new')
+      # Our tests are not that stable with the new headless mode, but since
+      # Chrome 120 the old headless mode has browser name
+      # "chrome-headless-shell". This name is not recognized by the current
+      # selenium-webdriver and so some extensions like `execute_cdp` are
+      # missing. This wil be fixed in next selenium-webdriver version. See
+      # https://github.com/SeleniumHQ/selenium/pull/13271 for more information.
+      #
+      # In the meantime, the :chrome_headless_new metadata allows activating the
+      # new headless for tests that need it.
+      if RSpec.current_example.metadata[:chrome_headless_new]
+        options.add_argument('--headless=new')
+      else
+        options.add_argument('--headless=old')
+      end
     end
 
     options.add_argument('--no-sandbox')