Fix: don't need to reload the whole page to refresh_children from the container view

common/lib/xmodule/xmodule/public/js/library_content_edit.js

 /* JavaScript for special editing operations that can be done on LibraryContentXBlock */
 window.LibraryContentAuthorView = function (runtime, element) {
     "use strict";
-    var usage_id = $(element).data('usage-id');
+    var $element = $(element);
+    var usage_id = $element.data('usage-id');
     // The "Update Now" button is not a child of 'element', as it is in the validation message area
     // But it is still inside this xblock's wrapper element, which we can easily find:
-    var $wrapper = $(element).parents('*[data-locator="'+usage_id+'"]');
+    var $wrapper = $element.parents('*[data-locator="'+usage_id+'"]');
 
     // We can't bind to the button itself because in the bok choy test environment,
     // it may not yet exist at this point in time... not sure why.
@@ -21,12 +22,15 @@ window.LibraryContentAuthorView = function (runtime, element) {
                 state: 'end',
                 element: element
             });
-            // runtime.refreshXBlock(element);
-            // The above does not work, because this XBlock's runtime has no reference
-            // to the page (XBlockContainerPage). Only the Vertical XBlock's runtime has
-            // a reference to the page, and we have no way of getting a reference to it.
-            // So instead we:
-            location.reload();
+            if ($element.closest('.wrapper-xblock').is(':not(.level-page)')) {
+                // We are on a course unit page. The notify('save') should refresh this block,
+                // but that is only working on the container page view of this block.
+                // Why? On the unit page, this XBlock's runtime has no reference to the
+                // XBlockContainerPage - only the top-level XBlock (a vertical) runtime does.
+                // But unfortunately there is no way to get a reference to our parent block's
+                // JS 'runtime' object. So instead we must refresh the whole page:
+                location.reload();
+            }
         });
     });
 };