Ticket #26633: 26633.patch

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

@@ -918 +918 @@
                         body = $( document.body ),
                         overlay = body.children('.wp-full-overlay');
 
-                // Prevent the form from saving when enter is pressed.
+                // Prevent the form from saving when enter is pressed on an input element.
                 $('#customize-controls').on( 'keydown', function( e ) {
-                        if ( $( e.target ).is('textarea') )
-                                return;
+                        var isEnter = ( 13 === e.which ),
+                                $el = $( e.target );
 
-                        if ( 13 === e.which ) // Enter
+                        if ( isEnter && ( $el.is( 'input:not([type=button])' ) || $el.is( 'select' ) ) ) {
                                 e.preventDefault();
+                        }
                 });
 
                 // Initialize Previewer