improve color chooser and name validation (#2622)

src/Configuration/StringAccessibleConfigTrait.php

@@ -17,6 +17,10 @@ trait StringAccessibleConfigTrait
      * @var array
      */
     protected $settings;
+    /**
+     * @var array
+     */
+    protected $original;
     /**
      * @var ConfigLoaderInterface
      */
@@ -29,7 +33,7 @@ trait StringAccessibleConfigTrait
     public function __construct(ConfigLoaderInterface $repository, array $settings)
     {
         $this->repository = $repository;
-        $this->settings = $settings;
+        $this->original = $this->settings = $settings;
     }
 
     /**
@@ -80,6 +84,17 @@ trait StringAccessibleConfigTrait
      */
     abstract protected function getPrefix(): string;
 
+    /**
+     * @param string $key
+     * @return mixed
+     */
+    public function default(string $key)
+    {
+        $key = $this->prepareSearchKey($key);
+
+        return $this->get($key, $this->original);
+    }
+
     /**
      * @param string $key
      * @return mixed