[random test failure] ResponsiveImageFieldUiTest::testResponsiveImageFormatterUi() again

Problem/Motivation

ResponsiveImageFieldUiTest::testResponsiveImageFormatterUi() still contains a race condition and will randomly fail.

Background

This is a followup to #3565218: [random test failure] ResponsiveImageFieldUiTest::testResponsiveImageFormatterUi(), which fixed another flaky assertion in the same test.

Steps to reproduce

https://git.drupalcode.org/issue/drupal-3008172/-/jobs/13531022

Proposed resolution

--- a/core/modules/responsive_image/tests/src/FunctionalJavascript/ResponsiveImageFieldUiTest.php
+++ b/core/modules/responsive_image/tests/src/FunctionalJavascript/ResponsiveImageFieldUiTest.php
@@ -88,7 +88,8 @@
     $field_image_type = $page->findField('fields[field_image][type]');
     $field_image_type->setValue('responsive_image');
 
-    $summary_text = $assert_session->waitForElement('xpath', $this->cssSelectToXpath('#field-image .ajax-new-content .field-plugin-summary'));
+    $summary_text = $assert_session->waitForElementVisible('css', '#field-image .ajax-new-content .field-plugin-summary');
+    $this->assertNotNull($summary_text);
     $this->assertEquals('Select a responsive image style. Loading attribute: lazy', $summary_text->getText());
 
     $page->pressButton('Save');

Remaining tasks

Review.

User interface changes

None.

Introduced terminology

None.

API changes

None.

Data model changes

None.

Release notes snippet

n/a