Ticket #32492: customize.32492.diff

wp-admin/js/customize-controls.js

@@ -2920 +2920 @@
                         }
 
                         event.preventDefault(); // Keep this AFTER the key filter above
+                        api.section.each( function ( section ) {
+                                section.collapse( { duration: 0 } );
+                        });
                         api.panel.each( function ( panel ) {
                                 panel.collapse();
                         });