Include option labels in search keywords

Resolves #9799

Author: brandonkelly

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 ### Changed
+- Checkboxes, Dropdown, Multi-select, and Radio Buttons fields now include the selected options’ labels in their search keywords. ([#9799](https://github.com/craftcms/cms/issues/9799))
 - It’s now possible for field types to disable delta name registration for nested custom fields by calling `Craft::$app->view->setIsDeltaRegistrationActive(false);` before rendering them.
 - `craft\models\FieldLayout::createForm()` now accepts a `registerDeltas` key in its `$config` argument, which can be set to `true` or `false` to enable/disable delta name registration for any custom fields in the form.
 - `craft\services\Elements::duplicateElement()` now has a `$placeInStructure` argument.

src/fields/BaseOptionsField.php

@@ -309,6 +309,30 @@ public function serializeValue($value, ElementInterface $element = null)
         return parent::serializeValue($value, $element);
     }
 
+    /**
+     * @inheritdoc
+     */
+    protected function searchKeywords($value, ElementInterface $element): string
+    {
+        $keywords = [];
+
+        if ($this->multi) {
+            /** @var MultiOptionsFieldData|OptionData[] $value */
+            foreach ($value as $option) {
+                $keywords[] = $option->value;
+                $keywords[] = $option->label;
+            }
+        } else {
+            /** @var SingleOptionFieldData $value */
+            if ($value->value !== null) {
+                $keywords[] = $value->value;
+                $keywords[] = $value->label;
+            }
+        }
+
+        return implode(' ', $keywords);
+    }
+
     /**
      * @inheritdoc
      * @since 3.4.6