Media Library widget display doesn't return to first page on applying filters

Closes #3272629

core/modules/media_library/tests/src/FunctionalJavascript/WidgetViewsTest.php

@@ -116,7 +116,25 @@ public function testWidgetViews() {
     $assert_session->pageTextContains('Bear');
     $assert_session->pageTextNotContains('Turtle');
 
-    // Assert the exposed filters can be applied.
+    // Assert the exposed filters can be applied and page is reset from second
+    // page.
+    $page->clickLink('Next page');
+    $this->waitForElementTextContains('.js-media-library-view .js-pager__items > li:nth-of-type(2)', 'Page 2');
+    $page->fillField('Name', 'Bear');
+    $page->pressButton('Apply filters');
+    $assert_session->assertWaitOnAjaxRequest();
+    $assert_session->pageTextNotContains('Dog');
+    $assert_session->pageTextContains('Bear');
+    $assert_session->pageTextNotContains('Turtle');
+
+    // Test clearing the filters.
+    $page->fillField('Name', '');
+    $page->pressButton('Apply filters');
+    $assert_session->waitForLink('Next page');
+    $page->clickLink('Next page');
+    $this->waitForElementTextContains('.js-media-library-view .js-pager__items > li:nth-of-type(2)', 'Page 2');
+
+    // Assert the exposed filters are persisted when changing display.
     $page->fillField('Name', 'Dog');
     $page->pressButton('Apply filters');
     $assert_session->assertWaitOnAjaxRequest();
@@ -127,7 +145,6 @@ public function testWidgetViews() {
     $assert_session->linkExists('Table');
     $this->switchToMediaLibraryGrid();
 
-    // Assert the exposed filters are persisted when changing display.
     $this->assertSame('Dog', $page->findField('Name')->getValue());
     $assert_session->pageTextContains('Dog');
     $assert_session->pageTextNotContains('Crocodile');