reverted:
--- b/core/modules/views_ui/js/views-admin.js
+++ a/core/modules/views_ui/js/views-admin.js
@@ -277,8 +277,6 @@
 
       var group = this.$controlGroup.val();
 
-      // Search through the search texts in the form for matching text.
-      var activeViews = 0;
       this.options.forEach(function (option) {
         function hasWord(word) {
           return option.searchText.indexOf(word) !== -1;
@@ -294,15 +292,9 @@
         }
 
         option.$div.toggle(found);
-        activeViews += found;
       });
 
       $(event.target).trigger('dialogContentResize');
-
-      Drupal.announce(
-        Drupal.formatPlural(activeViews, '1 option is available in the modified list.', '@count options are available in the modified list.')
-      );
-
     }
   });
 
only in patch2:
unchanged:
--- a/core/modules/views_ui/tests/src/FunctionalJavascript/FilterOptionsTest.php
+++ b/core/modules/views_ui/tests/src/FunctionalJavascript/FilterOptionsTest.php
@@ -55,6 +55,8 @@ public function testFilterOptionsAddFields() {
     });
     $this->assertTrue($page->findField('name[views.views_test_field_1]')->isVisible());
     $this->assertFalse($page->findField('name[views.views_test_field_2]')->isVisible());
+    $session->wait(1000, 'jQuery("#drupal-live-announce").html().indexOf("1 option is available in the modified list.") > -1');
+    $web_assert->elementTextContains('css', '#drupal-live-announce', '1 option is available in the modified list.');
 
     // Test the ".description" field in search.
     $options_search->setValue('FIELD_2_DESCRIPTION');
only in patch2:
unchanged:
--- a/core/modules/views_ui/views_ui.libraries.yml
+++ b/core/modules/views_ui/views_ui.libraries.yml
@@ -7,6 +7,7 @@ views_ui.admin:
   dependencies:
     - core/jquery
     - core/drupal
+    - core/drupal.announce
     - core/drupalSettings
     - core/jquery.once
     - core/jquery.form