Merge pull request #12222 from edx/benp/flaky-notes-condition-ff42

wait needed for notes pages.

common/test/acceptance/tests/lms/test_lms_edxnotes.py

@@ -872,18 +872,27 @@ class EdxNotesPageTest(EventsTestMixin, EdxNotesTestMixin):
 
         self._add_default_notes()
         self.notes_page.visit()
+        # visiting the page results in an ajax request to fetch the notes
+        self.notes_page.wait_for_ajax()
         note = self.notes_page.notes[0]
         assert_page(note, self.raw_note_list[4]['usage_id'], "Recent Activity")
 
         self.notes_page.visit().switch_to_tab("structure")
+        # visiting the page results in an ajax request to fetch the notes
+        self.notes_page.wait_for_ajax()
         note = self.notes_page.notes[1]
         assert_page(note, self.raw_note_list[2]['usage_id'], "Location in Course")
 
         self.notes_page.visit().switch_to_tab("tags")
+        # visiting the page results in an ajax request to fetch the notes
+        self.notes_page.wait_for_ajax()
         note = self.notes_page.notes[0]
         assert_page(note, self.raw_note_list[2]['usage_id'], "Tags")
 
         self.notes_page.visit().search("Fifth")
+        # visiting the page results in an ajax request to fetch the notes
+        self.notes_page.wait_for_ajax()
+
         note = self.notes_page.notes[0]
         assert_page(note, self.raw_note_list[4]['usage_id'], "Search Results")