Ticket #33258: 33258.2.diff

src/wp-admin/css/customize-controls.css

@@ -498 +498 @@
 }
 
 .wp-full-overlay.section-open #customize-controls .wp-full-overlay-sidebar-content {
-        visibility: hidden;
         overflow-y: hidden;
 }
 

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

@@ -1270 +1270 @@
 
                         if ( expanded ) {
 
-                                if ( 'undefined' != typeof api.section( self.section ) && ! api.section( self.section ).expanded() ) {
+                                if ( self.section() && api.section( self.section() ) ) {
                                         self.expandControlSection();
                                 }