Issue #3063092 by MegaChriz, bruno.bicudo, iyyappan.govind: Added "Save and...

Issue #3063092 by MegaChriz, bruno.bicudo, iyyappan.govind: Added "Save and add mapping" button on Migration creation page.

modules/feeds_migrate_ui/src/Form/MigrationForm.php

@@ -9,6 +9,7 @@ use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Form\SubformState;
 use Drupal\Core\Render\Renderer;
+use Drupal\Core\Url;
 use Drupal\feeds_migrate\Plugin\MigrateFormPluginFactory;
 use Drupal\migrate\Plugin\MigratePluginManagerInterface;
 use Drupal\migrate\Plugin\MigrationPluginManagerInterface;
@@ -149,11 +150,26 @@ class MigrationForm extends EntityForm {
    */
   protected function actions(array $form, FormStateInterface $form_state) {
     $actions = parent::actions($form, $form_state);
-    $actions['submit']['#value'] = $this->t('Save');
+
+    if ($this->entity->isNew()) {
+      $actions['submit']['#value'] = $this->t('Save and add mappings');
+      $actions['submit']['#submit'][] = '::toMapping';
+    }
+    else {
+      $actions['submit']['#value'] = $this->t('Save');
+    }
 
     return $actions;
   }
 
+  /**
+   * Redirects to mappings when the user saves a new migration.
+   */
+  public function toMapping(array &$form, FormStateInterface $form_state) {
+    $migration = $form['id']['#value'];
+    $form_state->setRedirectUrl(Url::fromRoute('entity.migration.mapping.list', ['migration' => $migration]));
+  }
+
   /**
    * {@inheritdoc}
    */