Ensure value callbacks get correct input on array item remove

Author: Dominic Tubach

src/Form/Control/Callbacks/ArrayCallbacks.php

@@ -54,6 +54,7 @@ public static function addItem(array &$form, FormStateInterface $formState): voi
     $data = $formObject->calculateData($formState);
     $formState->setTemporary($data);
 
+    $formState->clearErrors();
     $formState->setRebuild();
   }
 
@@ -145,6 +146,13 @@ public static function removeItem(array &$form, FormStateInterface $formState):
     Assertion::integer($pos);
     $indexToRemove = (int) substr($name, $pos + 1);
 
+    $input = &NestedArray::getValue($formState->getUserInput(), $propertyPath);
+    if (is_array($input)) {
+      // Update input so value callbacks get the correct values.
+      unset($input[$indexToRemove]);
+      $input = array_values($input);
+    }
+
     $arrayItems = $formState->getValue($propertyPath);
     Assertion::isArray($arrayItems);
     unset($arrayItems[$indexToRemove]);
@@ -163,6 +171,7 @@ public static function removeItem(array &$form, FormStateInterface $formState):
     Assertion::integer($numItems);
     $propertyAccessor->setProperty('numItems', $numItems - 1);
 
+    $formState->clearErrors();
     $formState->setRebuild();
   }