In user profile changing page should reposition window to top

When we change the page using pagination in the user
profile page the data gets updated but the position
of the window remains at pagination. It should change
position of window to top.

TNL-107

common/test/acceptance/tests/discussion/test_discussion.py

@@ -419,6 +419,7 @@ class DiscussionUserProfileTest(UniqueCourseTest):
         current_page = 1
         total_pages = max(num_threads - 1, 1) / self.PAGE_SIZE + 1
         all_pages = range(1, total_pages + 1)
+        return page
 
         def _check_page():
             # ensure the page being displayed as "current" is the expected one
@@ -479,6 +480,12 @@ class DiscussionUserProfileTest(UniqueCourseTest):
     def test_151_threads(self):
         self.check_pages(151)
 
+    def test_pagination_window_reposition(self):
+        page = self.check_pages(50)
+        page.click_next_page()
+        page.wait_for_ajax()
+        self.assertTrue(page.is_window_on_top())
+
 
 @attr('shard_1')
 class DiscussionSearchAlertTest(UniqueCourseTest):