Fixed #7639. Fixes bug that orderInterval has not been respected.

extension/Classes/Core/AbstractBuildForm.php

@@ -2810,7 +2810,12 @@ abstract class AbstractBuildForm {
         // Handle DragAndDrop
         $dndAttributes = '';
         if ($hasDragAndDrop) {
-            $orderInterval = 10;
+
+            $orderInterval = $formElement[FE_ORDER_INTERVAL] ?? FE_ORDER_INTERVAL_DEFAULT;
+            if ($orderInterval == '' || !is_numeric($orderInterval)) {
+                $orderInterval = FE_ORDER_INTERVAL_DEFAULT;
+            }
+
             $numColumns = 0;
             if (count($formElement[FE_SQL1]) > 0) {
                 $numColumns = count($formElement[FE_SQL1][0]) + (int)$flagDelete + (int)($flagNew || $flagEdit);

extension/Classes/Core/Constants.php

@@ -1317,6 +1317,7 @@ const FE_TYPE_PILL = 'pill';
 const FE_HTML_ID = 'htmlId'; // Will be dynamically computed during runtime.
 
 const FE_ORDER_INTERVAL = 'orderInterval';
+const FE_ORDER_INTERVAL_DEFAULT = '10';
 const FE_ORDER_COLUMN = 'orderColumn';
 const FE_DND_TABLE = 'dndTable';