Improve JS method reliability

Author: mdmintz

seleniumbase/fixtures/base_case.py

@@ -3130,9 +3130,11 @@ def export_tour(self, name=None, filename="my_tour.js", url=None):
     def activate_jquery_confirm(self):
         """ See https://craftpip.github.io/jquery-confirm/ for usage. """
         js_utils.activate_jquery_confirm(self.driver)
+        self.wait_for_ready_state_complete()
 
     def activate_messenger(self):
         js_utils.activate_messenger(self.driver)
+        self.wait_for_ready_state_complete()
 
     def set_messenger_theme(self, theme="default", location="default",
                             max_messages="default"):

seleniumbase/fixtures/js_utils.py

@@ -457,6 +457,7 @@ def activate_messenger(driver):
                  "theme: 'future'}")
 
     add_js_link(driver, jquery_js)
+    wait_for_jquery_active(driver, timeout=0.2)
     add_css_link(driver, messenger_css)
     add_css_link(driver, msgr_theme_flat_css)
     add_css_link(driver, msgr_theme_future_css)