Ticket #22606: 22606.patch

wp-admin/js/customize-controls.js

@@ -886 +886 @@
                         event.preventDefault();
                 });
 
+                $('.upload-dropzone a.upload').keydown( function( event ) {
+                        if ( 13 === event.which ) // enter
+                                this.click();
+                });
+
                 $('.collapse-sidebar').on( 'click keydown', function( event ) {
                         if ( event.type === 'keydown' &&  13 !== event.which ) // enter
                                 return;