Update renderPlain() to RendererInterface::renderInIsolation() as reported by PHPStan

Hi @lostcarpark,

I have resolved the RendererInterface::renderInIsolation() issue and created MR!21.

Kindly review and verify.

Thanks!

Thank you for your work on this.

The tests are passing now for current and next_major.

Unfortunately, they are failing for previous_minor and previous_major. This is because renderInIsolation was only introduced in Drupal 10.3.

For previous_minor, we could use DeprecationHelper as follows:

$output = DeprecationHelper::backwardsCompatibleCall(
    currentVersion: \Drupal::VERSION,
    deprecatedVersion: '10.3',
    currentCallable: fn() => \Drupal::service('renderer')->renderInIsolation($build),
    deprecatedCallable: fn() => \Drupal::service('renderer')->renderPlain($build),
);

Unfortunately, DeprecationHelper was only introduced in 10.1, so for the moment at least, we'll need additional measures to keep support for Drupal 9.5. I think we need to support this at least while automated tests run against it. I think we could handle all supported versions with:

if (version_compare(\Drupal::VERSION, '10.1.0') >= 0) {
  // Drupal 10.1 or later, use DeprecationHelper.
  $output = DeprecationHelper::backwardsCompatibleCall(
    currentVersion: \Drupal::VERSION,
    deprecatedVersion: '10.3',
    currentCallable: fn() => \Drupal::service('renderer')->renderInIsolation($build),
    deprecatedCallable: fn() => \Drupal::service('renderer')->renderPlain($build),
  );
}
else {
  // Remove when we drop support for < Drupal 10.1.
  // @phpstan-ignore-next-line
  $output = \Drupal::service('renderer')->renderPlain($build);
}

Please update the fix and see if tests will pass.

I learned a much cleaner fix from @ankitv18:

    if (method_exists(RendererInterface::class, 'renderPlain')) {
        // @phpstan-ignore-next-line as it is deprecated in D10.3 and removed from D12.
        $field_output_renderer = \Drupal::service('renderer')->renderPlain($field_output);
      }
      else {
        $field_output_renderer = \Drupal::service('renderer')->renderInIsolation($field_output);
      }

Change merged as needed for D11 release.