Issue #2949260 by borisson_: Show active facets even when "Hide facet with 1 result" is selected

src/Plugin/facets/processor/HideOnlyOneItemProcessor.php

@@ -24,7 +24,7 @@ class HideOnlyOneItemProcessor extends ProcessorPluginBase implements BuildProce
    * {@inheritdoc}
    */
   public function build(FacetInterface $facet, array $results) {
-    if (count($results) === 1) {
+    if (count($results) === 1 && !$results[0]->isActive()) {
       return [];
     }
 

tests/src/Functional/ProcessorIntegrationTest.php

@@ -768,6 +768,12 @@ class ProcessorIntegrationTest extends FacetsTestBase {
   public function testHideOnlyOneItemProcessor() {
     $entity_test_storage = \Drupal::entityTypeManager()
       ->getStorage('entity_test_mulrev_changed');
+
+    // Load all items and delete them.
+    $all = $entity_test_storage->loadMultiple();
+    foreach ($all as $item) {
+      $item->delete();
+    }
     $entity_test_storage->create([
       'name' => 'baz baz',
       'body' => 'foo test',
@@ -775,7 +781,6 @@ class ProcessorIntegrationTest extends FacetsTestBase {
       'keywords' => ['kiwi'],
       'category' => 'article_category',
     ])->save();
-
     $this->indexItems($this->indexId);
 
     $facet_name = 'Drupalcon Vienna';
@@ -790,8 +795,7 @@ class ProcessorIntegrationTest extends FacetsTestBase {
     $this->drupalPostForm($this->editForm, $form, 'Save');
     $this->drupalGet('search-api-test-fulltext');
 
-    $this->assertFacetBlocksAppear();
-    $this->clickLink('kiwi');
+    $this->assertSession()->pageTextContains(' Displaying 1 search results');
     $this->assertNoFacetBlocksAppear();
   }
 

tests/src/Unit/Plugin/processor/HideOnlyOneItemProcessorTest.php

@@ -33,6 +33,25 @@ class HideOnlyOneItemProcessorTest extends UnitTestCase {
     $this->assertCount(0, $processed_results);
   }
 
+  /**
+   * Tests with one result that is already active.
+   *
+   * @covers ::build
+   */
+  public function testWithOneActiveResult() {
+    $processor = new HideOnlyOneItemProcessor([], 'hide_only_one_item', []);
+    $facet = new Facet([], 'facets_facet');
+    $results = [
+      new Result($facet, '1', 1, 1),
+    ];
+    $results[0]->setActiveState(TRUE);
+    $facet = $this->getMockBuilder(Facet::class)
+      ->disableOriginalConstructor()
+      ->getMock();
+    $processed_results = $processor->build($facet, $results);
+    $this->assertCount(1, $processed_results);
+  }
+
   /**
    * Tests with one result.
    *