Ticket #43556: 43556.diff

src/wp-admin/js/customize-widgets.js

@@ -1630 +1630 @@
                                  */
                                 getActiveSectionCount = function() {
                                         return _.filter( panel.sections(), function( section ) {
-                                                return section.active();
+                                                return 'sidebar' === section.params.type && section.active();
                                         } ).length;
                                 };