Ticket #36627: 36627.03.patch

src/wp-admin/js/theme.js

@@ -577 +577 @@
 
                 // Disable previous at the zero position
                 if ( 0 === this.model.collection.indexOf( current ) ) {
-                        $themeInstaller.find( '.previous-theme' ).addClass( 'disabled' );
+                        $themeInstaller.find( '.previous-theme' )
+                                .addClass( 'disabled' )
+                                .prop( 'disabled', true );
                 }
 
                 // Disable next if the next model is undefined
                 if ( _.isUndefined( this.model.collection.at( this.model.collection.indexOf( current ) + 1 ) ) ) {
-                        $themeInstaller.find( '.next-theme' ).addClass( 'disabled' );
+                        $themeInstaller.find( '.next-theme' )
+                                .addClass( 'disabled' )
+                                .prop( 'disabled', true );
                 }
         },