Imlementing SetIgnoreDestination and getIgnoreDestination

Closes #3409489

src/Form/SubFormState.php

@@ -49,6 +49,13 @@ class SubFormState implements FormStateInterface {
    */
   protected $subKeys;
 
+  /**
+   * The property which stores the destination status.
+   *
+   * @var bool
+   */
+  private $ignoreDestination = TRUE;
+
   /**
    * Internal storage for the sub-state, writing into the main form state.
    *
@@ -839,4 +846,18 @@ class SubFormState implements FormStateInterface {
     return $this;
   }
 
+   /**
+   * {@inheritdoc}
+   */
+  public function setIgnoreDestination($value = TRUE) {
+    $this->set('ignore_destination', $value);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getIgnoreDestination() {
+    return $this->get('ignore_destination');
+  }
+
 }