Issue #3177546 by alexpott:...

Issue #3177546 by alexpott: \Drupal\views\Plugin\views\PluginBase::listLanguages() incorrectly uses in_array() resulting in listing additional languages

core/modules/language/tests/src/Kernel/Views/FilterLanguageTest.php

@@ -31,7 +31,7 @@ public function testFilter() {
           'id' => 'langcode',
           'table' => 'views_test_data',
           'field' => 'langcode',
-          'value' => [$langcode],
+          'value' => [$langcode => $langcode],
         ],
       ]);
       $this->executeView($view);
@@ -44,7 +44,6 @@ public function testFilter() {
       $expected = [
         '***LANGUAGE_site_default***',
         '***LANGUAGE_language_interface***',
-        '***LANGUAGE_language_content***',
         'en',
         'xx-lolspeak',
         'und',

core/modules/views/src/Plugin/views/PluginBase.php

@@ -603,7 +603,7 @@ protected function listLanguages($flags = LanguageInterface::STATE_ALL, array $c
           // If this (non-configurable) type is among the current values,
           // add that option too, so it is not lost. If not among the current
           // values, skip displaying it to avoid user confusion.
-          if (isset($type['name']) && !isset($list[$id]) && in_array($id, $current_values)) {
+          if (isset($type['name']) && !isset($list[$id]) && in_array($id, $current_values, TRUE)) {
             $list[$id] = $this->t('@type language selected for page', ['@type' => $type['name']]);
           }
         }