Issue #2871709 part 2: Add support for included adjustments in the UI.

Author: bojanz

modules/order/src/Plugin/Field/FieldWidget/AdjustmentDefaultWidget.php

@@ -73,7 +73,6 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
       '#title' => $this->t('Label'),
       '#default_value' => ($adjustment) ? $adjustment->getLabel() : '',
     ];
-
     $element['definition']['amount'] = [
       '#type' => 'commerce_price',
       '#title' => t('Amount'),
@@ -85,6 +84,11 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
         ],
       ],
     ];
+    $element['definition']['included'] = [
+      '#type' => 'checkbox',
+      '#title' => t('Included in the base price'),
+      '#default_value' => ($adjustment) ? $adjustment->isIncluded() : FALSE,
+    ];
 
     return $element;
   }
@@ -103,6 +107,7 @@ public function massageFormValues(array $values, array $form, FormStateInterface
         'label' => $value['definition']['label'],
         'amount' => new Price($value['definition']['amount']['number'], $value['definition']['amount']['currency_code']),
         'source_id' => $value['source_id'],
+        'included' => $value['definition']['included'],
       ]);
     }
     return $values;