ContextualLinksHelper::addLinks() assertion rejects the 'exposed_filter' location, fataling ViewsExposedFilterBlock

Problem/Motivation

ContextualLinksHelper::addLinks() opens with:

public function addLinks(array &$renderElement, string $location, string $displayId, ?array $viewElement = NULL): void {
  assert(in_array($location, ['block', 'page', 'view'], TRUE));

But Drupal\views\Plugin\Block\ViewsExposedFilterBlock::build() calls into this path with the location 'exposed_filter':

// ViewsExposedFilterBlock::build()
$this->addContextualLinks($output, 'exposed_filter');

ViewsBlockBase::addContextualLinks() forwards that $block_type straight through to addLinks() as $location. With zend.assertions=1, this throws:

AssertionError: assert(in_array($location, ['block', 'page', 'view'], TRUE))
in assert() (line 79 of core/modules/views/src/ContextualLinksHelper.php).
Drupal\views\ContextualLinksHelper->addLinks()
Drupal\views\Plugin\Block\ViewsBlockBase->addContextualLinks()
Drupal\views\Plugin\Block\ViewsExposedFilterBlock->build()
Drupal\block\BlockViewBuilder::preRender()

Steps to reproduce

• Install Drupal 11.4.x with the standard profile (assertions enabled — the default outside production, e.g. via development.services.yml / SymfonyRequirements).
• Enable the Views and Contextual Links modules.
• Create (or use) a view with an exposed filter and an "Exposed form in block" enabled, or use any view display that exposes its filters as a block.
• Place the view's "Exposed form: …" block in a visible region (e.g. Header) at Structure → Block layout.
• Visit any page where that block renders, as a user with permission to see contextual links (e.g. an admin).
• Result: AssertionError / WSOD on every page that renders the block.
• Expected: The page renders and the exposed-filter block shows its contextual links, as it did prior to 11.4.

Proposed resolution

Add 'exposed_filter' to the allowlist in the assertion so it matches the locations the method already supports:

assert(in_array($location, ['block', 'page', 'view', 'exposed_filter'], TRUE));

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet